Free Image resizer (longest side presets)
Pick an image up to 60 MB (same rules as our other image tools: common image/* plus .heic / .heif / .tif / .tiff when MIME is missing). The longest side is scaled down to your chosen pixel cap; smaller images are never enlarged. Choose JPEG or WebP for smaller files, PNG to keep transparency losslessly on the scaled bitmap. Processing stays in this tab — no upload.
How to use this tool
- 1
Open Image resizer
Use it for this task: PNG, JPEG, WebP photo resizing, longest-edge presets, fine slider, high-fidelity downscale - local only.
- 2
Choose an image file
Drag an image into the upload area or click the button, then adjust the image options shown on the page.
- 3
Download or copy the image result
Preview the processed image first, then download it or copy it when the tool supports copying.
Quick facts
| Runs offline? | Yes — after this script loads, decode and encode use only your browser. |
|---|---|
| Upload to a server? | No. Safe Local Tools is static; bytes stay in this tab. |
| Same engine as the compressor? | Yes — same decode path and canvas scaling; this page emphasizes quick long-edge presets for resizing workflows. |
| Exact Instagram crop? | Not yet — presets only cap the longest side (contain-style scaling). Use an editor for fixed aspect crops. |
Top use cases
- PNG, JPEG, WebP photo resizing, longest-edge presets, fine slider, high-fidelity downscale - local only.
- Runs offline?: Yes — after this script loads, decode and encode use only your browser.
- Upload to a server?: No. Safe Local Tools is static; bytes stay in this tab.
- Same engine as the compressor?: Yes — same decode path and canvas scaling; this page emphasizes quick long-edge presets for resizing workflows.
- Exact Instagram crop?: Not yet — presets only cap the longest side (contain-style scaling). Use an editor for fixed aspect crops.
FAQ
Resize vs compressor?▾
Both use the same pipeline. This page highlights one-click long-edge targets for “make it fit N px” tasks; the compressor page groups more copy around compression tradeoffs.
Will my photo be enlarged?▾
No — if both sides are already below the cap, output dimensions match the decoded bitmap (aside from re-encoding).
Can I resize HEIC from iPhone?▾
Yes when decoding succeeds — Safari often opens HEIC natively; Chromium browsers may load the bundled HEIC decoder after native decode fails.
Does EXIF orientation apply?▾
createImageBitmap typically applies orientation metadata, so previews should match your gallery.
Animated GIF?▾
Pick GIF output to re-encode the full animation in-browser (frame cap). Other formats still preview from the first decoded frame.
Privacy?▾
Processing is local; clear downloads and previews on shared machines.