GITNUXSOFTWARE REVIEW
Art DesignTop 10 Best Image Stacking Software of 2026
Compare image stacking software tools for stacking photos, including AstroSurface and AutoStakkert!, with tradeoffs for editors and photographers.
How we ranked these tools
Vendors set the topic, but our editors set the inclusion criteria and the evaluation framework before research starts.
Search agents gather the source set and the review record, including transcriptions of video reviews and podcasts.
Framework: Features 40% · Ease 30% · Value 30%
Gitnux may earn a commission through links on this page — this does not influence rankings. Editorial policy
AstroSurface is the best overall pick for solo astrophotographers because its stage-based pipeline keeps calibration, registration, and combine settings organized and reusable across your workflow, while ON1 Photo RAW is the better all-in-one alternative for photographers since the stack result workflow stays inside a familiar editor for finishing.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
AstroSurface
Stage-based stacking pipeline design that persists settings across calibration, registration, and combine steps.
Best for: Fits when solo astrophotographers need a stage-based stacking pipeline with controllable rejection and alignment.
AutoStakkert!
Editor pickQuality-guided frame selection and alignment scoring built for planetary lucky imaging sequences.
Best for: Fits when astrophotography users need repeatable lucky imaging stacking with quality-based frame selection.
ON1 Photo RAW
Editor pickThe stack result workflow stays inside ON1 Photo RAW, so registration choices can feed directly into wavelet-based sharpening and finishing controls.
Best for: Fits when photographers need an editor plus stacking workflow without switching tools.
Comparison Table
AstroSurface
vertical specialistWindows astronomy software for planetary stacking, processing, and sharpening.
Stage-based stacking pipeline design that persists settings across calibration, registration, and combine steps.
AstroSurface performs astrophotography image stacking for deep-sky and planetary workflows using a multi-step pipeline that covers calibration, alignment, and combining. The tool focuses on practical registration and stacking controls for large sets of light frames, with options that affect rejection and merge behavior.
It also supports common scientific image interchange so stacks can be reviewed and reprocessed outside the app. AstroSurface is distinct for how its stack operations are organized as repeatable stages rather than a single combine dialog.
- +Stage-based stacking workflow keeps calibration, alignment, and combine separated
- +Registration controls support sub-pixel adjustment for tighter star matches
- +Wide image I/O options support common astrophotography file formats
- +Rejection controls help reduce artifacts during combine steps
- –Batch automation and scripting surface is limited compared with developer-first tools
- –Advanced parameter tuning can be time-consuming on large datasets
- –Limited governance controls for shared lab or team environments
- –Some edit operations feel less integrated into the stacking timeline
Planetary astrophotographers
Stack short planet exposures after selection
Sharper stacked planetary image
Solar imagers
Integrate aligned solar frames into one stack
Combined solar stack
Show 2 more scenarios
Lunar video imagers
Quality-filter and stack lunar frames
Higher-contrast lunar stack
Guides alignment and frame filtering, then stacks for improved lunar surface contrast and detail.
Deep-sky astrophotographers
Integrate calibrated deep-sky frames with rejection
Cleaner deep-sky integration
Aligns calibrated light frames and applies rejection and weighting to reduce transient artifacts in the merge.
Best for: Fits when solo astrophotographers need a stage-based stacking pipeline with controllable rejection and alignment.
AutoStakkert!
vertical specialistPlanetary imaging software for selecting, aligning, and stacking video frames.
Quality-guided frame selection and alignment scoring built for planetary lucky imaging sequences.
AutoStakkert! focuses on astrophotography stacking and planetary lucky imaging with an emphasis on frame quality estimation and alignment-driven combination. The workflow centers on registering light frames, selecting the best fraction, and applying sigma-style rejection during combine to reduce noise and improve SNR.
Integration with common scientific formats like FITS supports astronomy-centric pipelines. Automation is built around repeatable batch processing in the stacking workflow rather than general photo-editing automation.
- +Strong frame quality ranking for planetary lucky imaging stacks
- +Reliable sub-pixel star alignment output for high-resolution capture sequences
- +FITS input support fits astrophotography capture pipelines
- +Batch stacking workflow supports repeat runs across multiple sessions
- –Interface and workflow are tightly tuned for astronomy use cases
- –Limited extensibility compared with general image processing stacks
- –Fewer advanced post-stacking editing tools than typical editors
- –Parameter tuning for rejection and registration can be time-consuming
Solar imagers
Stack best frames from solar capture
Stacked solar image
Planetary astrophotographers
Align and stack sharp planet frames
Sharper planetary stack
Show 2 more scenarios
Wide-field astrophotographers
Filter and stack Milky Way sequences
Quality-filtered star stack
Sort and align star-rich frames then export a cleaner stack for follow-up processing.
Astrophotography pipeline users
Export aligned stacks for later tools
Intermediary stacks ready
Use batch stacking to produce intermediate results for stretching, deconvolution, or color work.
Best for: Fits when astrophotography users need repeatable lucky imaging stacking with quality-based frame selection.
ON1 Photo RAW
SMBON1 Photo RAW provides focus stacking and HDR merging within a photo workflow application for raw editing and cataloging.
The stack result workflow stays inside ON1 Photo RAW, so registration choices can feed directly into wavelet-based sharpening and finishing controls.
ON1 Photo RAW includes image stacking and alignment workflows inside its single photo editing environment, which supports composites that require consistent registration across source images. The stack workflow is designed for calibration-frame setups and star or feature alignment, helping users keep detail while managing noise in difficult scenes. Sharpening controls aimed at output help stacked results preserve micro-contrast at higher magnification for landscapes, technical work, and other detail-heavy compositions.
A practical tradeoff is that stacking relies on clean source alignment and calibration inputs, so inconsistent capture sequences can still produce visible artifacts after registration. This software fits best when a photographer wants one application to handle assembly steps and finishing controls, such as focus stack creation for technical images or star-focused astrophotography stacks that need dependable alignment.
- +Provides astrophotography-oriented stacking with calibration frames support
- +Includes sigma-clipping style combination options for noise rejection
- +Integrates stack result editing tools for cleanup and sharpening
- +Supports high-bit-depth export formats like TIFF 16-bit for retention
- –Registration controls can be less granular than dedicated stacking engines
- –Large stacks can slow responsiveness during alignment and preview
- –Advanced workflows rely on consistent input naming and manual staging
- –Automation and API access for stacking pipelines is limited
Astrophotography enthusiasts and imagers
Aligns stars with calibration frames
Sharper star fields
Landscape and technical photographers
Creates focus stacks for detail
Higher clarity near focus
Show 2 more scenarios
Architecture and real estate photographers
Assembles composites across viewpoints
More consistent composition
Uses stacking-oriented workflows within the editing app to combine multiple source photos.
Product photographers and teams
Stacks and refines catalog imagery
Uniform catalog presentation
Uses masking and batch-friendly processing to prepare consistent stacked product results for publication.
Best for: Fits when photographers need an editor plus stacking workflow without switching tools.
Adobe Photoshop
SMBPhotoshop supports layer-based image stacking for focus blending, astrophotography workflows, and noise reduction composites.
Reusable actions plus layer masks enable repeatable, inspected stacking-prep edits across many frames.
Photoshop enables stacking through layer-based alignment, opacity and blend modes, and reusable actions for repetitive steps. Calibration workflows can be approximated with math-style adjustment layers and masking, and outputs can be carried to 16-bit TIFF for further combine work. Visual inspection stays central, since registration and quality checks happen on the canvas rather than inside a dedicated stacking engine.
- +Layer-based alignment and masking for manual registration fixes
- +Non-destructive adjustment layers help validate calibration steps
- +16-bit TIFF export preserves tonal range for downstream work
- +Automation via actions and batch processing for repeated edits
- –No native sigma clipping or automated rejection logic
- –Large batch registration is slow compared with stacking tools
- –Astro formats like FITS require conversion before editing
- –Stack combining math and dithering-aware pipelines are not first-class
Astrophotography hobbyists
Manual alignment cleanup before stacking
Cleaner registration inputs
Imaging workflow operators
Repeatable calibration and background removal prep
Consistent preprocessing
Show 1 more scenario
Post-processing artists
Custom blending and tonal grading
Controlled final appearance
Creators use blend modes and adjustment layers to refine stacked look.
Best for: Fits when small astro datasets need manual alignment corrections before specialist stacking.
SharpCap
vertical specialistAstronomy capture software with live stacking and calibration features.
Live-guided capture controls that directly influence later star alignment and stacked result quality.
SharpCap is an astronomy capture and stacking tool designed for live workflows that start at the camera feed and continue through calibrated, registered combines. It supports stacking operations common in astrophotography stacking, including sigma clipping and selection-driven combine modes like median and average.
- +Calibration-aware stacking workflow with built-in capture-to-combine flow
- +Sigma clipping options support outlier rejection for light frame stacks
- +Star alignment and registration tools work inside the same app session
- +Live capture quality indicators help reduce unusable frames before stacking
- –Stacking automation and presets are less structured than general batch pipelines
- –Advanced workflows like drizzle-style integration are not a primary focus
- –Large projects can feel UI-heavy when switching between capture and stack steps
- –Output control for export formats is narrower than general post-processing suites
Deep-sky astrophotographers
Live stacking during active observation run
Progressively improved deep-sky stack
Star trail photographers
Automated RAW sequence capture for stacking
Uniform sequences for stacking
Show 2 more scenarios
Astrophotography workflow users
Export calibrated frames for downstream processing
Processing-ready capture files
Prepare FITS, TIFF, or frame sequences to continue editing, mosaics, or stacking elsewhere.
Planetary imagers
High-frame-rate planetary runs for sequences
Planet sequences for processing
Tune capture settings for repeat short planetary imaging runs to build sequence inputs.
Best for: Fits when astrophotography sessions need capture, registration, and stacking handled in one tool.
StarTools
vertical specialistAstrophotography processing software with tracking and stacking-aware noise reduction.
Tracking records signal and noise changes across edits to guide later denoising, sharpening, and detail recovery.
StarTools accepts integrated images in FITS format and provides dedicated controls for stars, nebulae, gradients, color, and fine detail. Tracking records how each operation changes image statistics, helping later modules separate genuine structure from processing artifacts. Mask-based adjustments let users isolate stars, backgrounds, or nebulae without exporting every correction to another application.
- +Tracking preserves noise context through successive processing modules
- +AutoDev adapts tonal development to uneven deep-sky brightness
- +Wipe targets gradients, vignetting, and color casts
- +Decon and Sharp modules recover fine stellar detail
- –Module order and workflow conventions require dedicated practice
- –StarTools lacks layer-based compositing for graphic design edits
- –Raw capture sets often need external calibration before processing
- –General-purpose retouching is thinner than Photoshop and Affinity Photo
Deep-sky astrophotographers
Recovering faint nebula detail
Cleaner nebula structure
Advanced hobbyist imagers
Iterating nonlinear detail workflows
More controlled processing
Show 2 more scenarios
Wide-field astrophotographers
Correcting gradient-heavy exposures
More even backgrounds
Wipe reduces sky gradients and vignetting before color and contrast adjustments affect faint subjects.
Astrophotography print makers
Refining stellar sharpness
Sharper star fields
Decon and Sharp target stellar profiles without requiring a general-purpose editor for core detail work.
Best for: Fits when astrophotographers want tracked, module-based processing after combining multiple deep-sky exposures.
AstroImageJ
researchAstronomical image analysis software built on ImageJ with stacking and calibration tools.
Entropy-based focus evaluation integrated into the capture-to-stack workflow.
AstroImageJ is an open source image stacking tool built for FITS-first astrophotography workflows. It supports registration and calibration flows with light, dark, bias, and flat frames, plus sigma clipping and median or average combination for noise reduction.
- +FITS-based stacking pipeline covers calibration frames and light frame workflows
- +Sigma clipping plus median and average combine options support outlier rejection
- +Registration tools target star alignment with sub-pixel refinement
- +Entropy-based focus evaluation helps tune capture quality before stacking
- –Desktop UI and workflow depth require learning stacking settings and conventions
- –Automation and API surface are limited compared with scriptable stacking pipelines
- –Parallel throughput depends on local CPU and does not provide distributed processing
- –Planetary workflows may require manual tuning beyond typical deep sky defaults
Deep-sky imagers and labs
Register, calibrate, and stack FITS exposures
Cleaner stacked astronomical composites
Observational astronomy teams
Review focus, tracking, and alignment quality
Faster identification of bad frames
Show 2 more scenarios
Astrophotographers and researchers
Apply bias, dark, and flat corrections
Calibrated image sequences
Bias, dark, and flat workflows produce calibrated FITS sequences for later stacking.
Selective astrophotography editors
Make targeted adjustments using previews and masks
Refined localized adjustments
Regions, histograms, and curves support localized background and star control after integration.
Best for: Fits when astrophotography stacking requires FITS-native calibration and sigma-clipping controls.
Zerene Stacker
vertical specialistFocus stacking application specialized for macro and entomology imaging.
Drizzle integration for producing higher-resolution stacked outputs from registered sub-pixel shifts.
Zerene Stacker is image stacking software focused on stacking engines, not a general photo editor. It performs image registration and alignment for multi-frame inputs, then applies stacking modes like median combine and average combine to produce a higher SNR result.
- +Multiple stacking modes with practical control over blend behavior
- +Planetary alignment tools that reduce star and feature misregistration
- +Wavelet-oriented sharpening that targets perceived detail without full global blur
- +Drizzle integration for higher-resolution output from dithered inputs
- –Workflow tuning requires familiarity with stacking settings and thresholds
- –Star and background behavior can vary across mixed-quality frame sets
- –FITS handling is strong, but format conversion steps can add friction
- –Automation and API access are limited compared with general-purpose processing suites
Photography educators and students
Teach repeatable focus stacking pipeline steps
Repeatable composite workflow
Photographers preparing final composites
Correct halos and ghosting after stacking
Cleaner final composite
Show 2 more scenarios
Astrophotographers and planetary imagers
Register and combine selected astro frames
Aligned registered composite
It aligns multi-frame sequences for stacked output that supports downstream astro editing.
Macro and micro photographers
Extend depth of field via stacking
Extended sharp depth
It helps merge focus-bracketed frames so small subjects stay sharp across more depth.
Best for: Fits when astrophotography or planetary lucky-imaging stacks need repeatable alignment and sharpening controls.
PhotoAcute Studio
vertical specialistPhotoAcute Studio specializes in multi-image stacking for noise reduction, resolution enhancement, and extended depth of field.
Batch-oriented stacking runs that combine registration, calibration handling, and multi-frame combine into a single queued workflow.
PhotoAcute Studio is an image stacking tool aimed at producing cleaner composite results through automated alignment and merge workflows. It focuses on repeatable batch processing for astrophotography-style image sets, including calibration frame usage and multi-step stacking flows.
- +Batch workflow supports stacking many frames with consistent settings
- +Registration and output steps are chained into a repeatable pipeline
- +Calibration-frame handling fits common astrophotography capture sets
- +Outputs target high-bit-depth workflows for further post-processing
- –Limited automation and API surface compared with developer-focused tools
- –Less control over advanced registration math and tuning parameters
- –Fewer extensibility points for custom stacking strategies
- –Quality can depend on input set uniformity more than expected
Astrophotography hobbyists and tinkerers
Stacking calibrated star field image sequences
More detail with less noise
Beginner content creators
Batch stacking for consistent product images
Sharper results across batches
Show 2 more scenarios
Night-sky photographers in teams
Shared calibration and stacking repeatability
Faster collaboration on sets
Uses multi-step batch flows so multiple users produce comparable stacked outputs.
Post-processing operators
High-bit-depth composites from RAW sets
Stable files for grading
Registers and combines image sequences while preserving output in common high-bit-depth formats.
Best for: Fits when small teams need repeatable astrophotography stacking without building a custom pipeline.
Photomatix
vertical specialistCommercial HDR stacking and tonemapping software.
Selective Deghosting lets photographers brush correction areas after automatic ghost removal.
Photographers handling interiors, architectural scenes, and high-contrast landscapes can process bracketed captures in a standalone desktop application. Photomatix Pro offers tone mapping, exposure fusion, automatic alignment, ghost removal, and preset-based batch processing. Lightroom Classic and Photoshop integration reduce file handoffs during established editing workflows.
- +Selective deghosting targets moving people, foliage, and vehicles.
- +Multiple tone-mapping and exposure-fusion methods support different visual styles.
- +Batch processing applies saved presets across multiple bracket sets.
- +Lightroom Classic and Photoshop integrations reduce manual file transfers.
- –No dedicated focus-stacking workflow supports depth-of-field composites.
- –Advanced local adjustments require an external editor.
- –Synthetic-looking HDR results can appear with aggressive presets.
- –Batch jobs provide less layer-level control than Photoshop.
Real-estate photographers
Bright-window interior composites
Balanced property photographs
Landscape photographers
High-contrast outdoor scenes
Controlled dynamic range
Show 1 more scenario
High-volume studios
Recurring bracket batches
Consistent batch output
Photomatix applies saved processing presets across repeated capture sets with limited manual intervention.
Best for: Fits when photographers need repeatable HDR merging for real estate, interiors, and high-contrast landscapes.
Conclusion
After evaluating 10 image stacking software, AstroSurface stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
Frequently Asked Questions About Image Stacking Software
Which tool handles deep-sky calibration frames best: StarTools, AstroImageJ, or SharpCap?
How do sigma-clipping workflows differ between AutoStakkert! and Zerene Stacker?
Which option is better for sub-pixel alignment and higher-resolution drizzle outputs: Zerene Stacker, AstroSurface, or Photoshop?
What breaks if calibration handling is inconsistent when stacking in ON1 Photo RAW versus PhotoAcute Studio?
How does Photoshop’s layer workflow change the stacking workflow compared with StarTools?
When should planetary lucky imaging use AutoStakkert! instead of AstroImageJ or SharpCap?
Which tool is most suited for stage-based persistence across calibration, registration, and combine: AstroSurface, Zerene Stacker, or StarTools?
How do HDR stacking expectations differ in Photomatix compared with astrophotography stack tools like AstroSurface?
Where does administrators and automation fit best: does any tool expose API-style integration, SSO, or RBAC controls?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
How to Choose the Right Image Stacking Software
In image stacking software, the real separation is how consistently it can align and combine your frames without artifacts, then how much control you get over the alignment and stacking steps in the workflow. Look first at alignment accuracy and stack controls because they directly affect sharpness, ghosting, and background consistency.
Alignment accuracy controls
Why it matters
Alignment accuracy controls determine whether frames land on the same stars or subjects. When alignment is off, stacking creates smears, doubling, or uneven detail.
How to check
Use a short burst of frames with slight motion and run a stack in the demo. Zoom into edges and corners and check for doubled stars or drifting detail after combination.
Stack method options
Why it matters
Stack method options matter because different combine modes respond differently to outliers and variable exposure. The wrong method can leave residual artifacts or flatten real contrast.
How to check
On the same input set, compare at least two combine options offered in the UI. Swap just the stack method and note changes in background uniformity and leftover specks after the stack.
Outlier rejection behavior
Why it matters
Outlier rejection behavior controls how the software treats frames with obvious defects. Better rejection reduces streaks and hot pixels without overly suppressing faint detail.
How to check
Include a few intentionally flawed frames (one with a bright blot or dust spot, if available). Run stacking with the outlier controls set to default, then adjust them and compare whether artifacts disappear without losing faint structures.
Output format and bit depth
Why it matters
Output format and bit depth affect whether your result keeps subtle gradients and fine tonal changes. Limited depth can introduce banding that looks like stacking failure.
How to check
Export the same stack result in the formats the tool supports. Inspect the export for banding and posterization in a smooth background region.
Automation and batch workflow
Why it matters
Automation and batch workflow reduces inconsistency when you process many frame sets. It also makes it easier to repeat the same settings for quality checks.
How to check
Ask the demo to run a small batch using the same settings across multiple input folders. Confirm the tool saves those settings and applies them identically to each run.
Project settings reproducibility
Why it matters
Project settings reproducibility matters when you need to revisit a stack months later. If settings aren’t retained clearly, it’s hard to diagnose why two results differ.
How to check
Create a project, run a stack, then reopen it later in the demo session. Verify the alignment, combine, and rejection settings are visible and can be re-run unchanged.
Red flags
- Alignment controls feel hidden or only offer one fixed mode
- Changing stack methods doesn’t noticeably affect artifact levels
- Exports show banding or lose tonal smoothness in gradients
Fit by situation
- If you process short bursts with noticeable motion, prioritize alignment accuracy controls.
- If your frame sets include occasional bad frames, prioritize outlier rejection behavior.
- If you repeat the same workflow across many targets, prioritize automation and batch workflow.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
Keep exploring
Comparing two specific tools?
Software Alternatives
See head-to-head software comparisons with feature breakdowns, pricing, and our recommendation for each use case.
Explore software alternatives→In this category
Art Design alternatives
See side-by-side comparisons of art design tools and pick the right one for your stack.
Compare art design tools→