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Long Screenshot Stitcher

Stitch consecutive screenshots locally in your browser into one long image with automatic overlap detection, duplicate removal, vertical or horizontal direction, manual overlap fixes, seam and edge fine-tuning, HEIC/HEIF input, PNG/JPEG/WebP output, and max export size controls.

Drag and drop images here or click to browse

Supports PNG / JPEG / WebP / AVIF / HEIC / HEIF input; PNG / JPEG / WebP output

Long Screenshot Stitcher

Quick Start

1
Import screenshots: Select consecutive PNG, JPEG, WebP, AVIF, HEIC, or HEIF files
2
Choose direction: Stitch vertical scrolls or horizontal captures
3
Keep auto dedupe: Let overlap detection remove repeated areas
4
Fix order: Drag screenshots or sort by name/time when sequence is wrong
5
Review and download: Fix low-confidence overlaps or seams, then export PNG, JPEG, or WebP

Preview Fine-tuning

Direction: Vertical/Horizontal stitching.
Auto dedupe: detects overlap between adjacent screenshots and removes duplicates.
Overlaps panel: manually enter overlap pixels per boundary (used for dedupe cropping); clear to return to auto. Works best together with Preview fine-tuning.
Max/Min overlap: narrows the search range to reduce false positives.
Tolerance / Scan step: higher tolerance is more forgiving; smaller step is more accurate but slower.
Diff / Confidence: lower diff and higher confidence means more reliable; review low-confidence boundaries.
Smart sort (experimental): tries to infer order automatically; may be unreliable with many/similar images.
In Preview, click the button on a seam to unlock (shows ✓). The view will auto-focus on that seam when needed; left-drag either image around the seam to fine-tune alignment (the seam line stays fixed). Right-drag pans the view; mouse wheel zooms.
When ↺ appears on a seam, click it to restore that seam’s adjustments.
For Top/Bottom (or Left/Right), unlock the edge button and drag near the edge in a large area to adjust cropping; the buttons follow the edge.
When ↺ appears on the edge, click it to restore cropping to 0.

Common Scenarios

Stitch scrolling web page screenshots (articles/docs/etc.)

Stitch chat log screenshots (WhatsApp/Telegram/etc.)

Stitch comics or long images in parts (needs stable overlap)

Stitch horizontal scrolling screenshots, wide tables, or comparison strips (Horizontal mode)

Dedupe & Overlap Settings

Direction: Vertical/Horizontal stitching.
Auto dedupe: detects overlap between adjacent screenshots and removes duplicates.
Overlaps panel: manually enter overlap pixels per boundary (used for dedupe cropping); clear to return to auto. Works best together with Preview fine-tuning.
Max/Min overlap: narrows the search range to reduce false positives.
Tolerance / Scan step: higher tolerance is more forgiving; smaller step is more accurate but slower.
Diff / Confidence: lower diff and higher confidence means more reliable; review low-confidence boundaries.
Smart sort (experimental): tries to infer order automatically; may be unreliable with many/similar images.

Usage Advice

Keep ~10–30% overlap between screenshots and avoid large dynamic regions (video/animations/infinite scroll).
If detection is unstable, fix the order first (drag, sort by time, reverse). Correct order usually matters more than tweaking.
Tune one parameter at a time: start with max/min overlap, then adjust tolerance/step for fine-tuning.
For low-confidence boundaries, manually set overlaps or temporarily disable auto dedupe before exporting.
If the output is very large, set a max export size to reduce memory usage and export failures.

Limitations & Compatibility

Requires stable overlap between adjacent screenshots; with no overlap or huge content differences, auto dedupe won't work.
Dynamic content can confuse detection and cause duplicates/missing parts.
Many/high-res screenshots can be memory-heavy and slow; try batching or resizing first.
Use the latest Chrome/Edge/Firefox or Safari 16+ (HEIC/HEIF support varies by browser).
This tool does not capture pages, run a browser extension, or turn recordings into long screenshots; it only stitches image files you already have.
PDF editing, redaction, OCR, and video/GIF frame workflows are separate tasks; this page stitches screenshot files you already have.
Photo panoramas, collage templates, annotations, and watermark editing belong to other image tools.
Exports are newly rendered from the browser canvas, so do not treat original image metadata as preserved.
Browser canvas output is limited to 32,767 px per side; extra-long results may be scaled down.

Privacy & Security

Long screenshot stitching runs in your browser. Source screenshots stay in page memory while this tool is open. Direction, overlap detection, scan tolerance, output format, quality, and max export size settings may stay in browser storage; if WebDAV sync is enabled, those settings may sync according to your settings. Manual overlap fixes, seam offsets, and edge crop values are runtime review state and may also sync through the WebDAV state schema while present. Screenshot files are not synced by default; they only enter WebDAV attachment sync when you explicitly enable attachment sync. The stitched PNG/JPEG/WebP file is generated for download and is not stored as a separate result. On shared devices, clear screenshots, results, saved settings, and site data when needed.

FAQ

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All tool processing happens locally in your browser.