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37 presets, 4 modes, batch ZIP export, browser-only.
An image resizer changes a photo's pixel dimensions to fit a target size, like an Instagram square post or a 1024x1024 App Store icon. Most online resizers upload your file to a server, rate-limit you, and watermark the output. This one does everything in your browser using the Canvas API. No upload, no quota, no watermark.
Pick a preset from the library (37 social media, app icon, favicon, and ad banner sizes), pick a mode (contain, cover, fill, or smart-crop), pick an output format (PNG, JPEG, or WebP), and download. Drop multiple files for batch processing, get back a ZIP.
Unlimited resizes, no signup, no upload size cap, no watermark on the output. ResizeImage.net adds a watermark on free tier files over 5MB; we don't.
Most resizers ship 5-10 presets. We track every social platform's specs plus the full iOS app icon set, plus favicons, plus banner ad standards, all categorized.
Drop 10 photos, get back 10 resized in a ZIP. ResizeImage and TinyImage paywall batch on the free tier or cap it at 5 files. We don't.
Photos never upload. Sensitive screenshots, personal images, client work all stay on your laptop. No way for us to see, log, or leak the file.
| Feature | Molixa | ResizeImage.net | iLoveIMG | TinyPNG |
|---|---|---|---|---|
| Preset library | 37 across 9 groups | 8 | 5 | 0 |
| Batch + ZIP | Yes, unlimited | Free 5 max, paid for more | Free 5 max | Compress only |
| Smart crop mode | Yes (rule of thirds) | No | No | No |
| App icon set generator | 10 sizes one click | Manual | Manual | No |
| WebP output | Yes | Paid | Yes | No |
| Free, no signup | Always | Watermark over 5MB | Free 5 / hour | 20 free / month |
| Browser-only privacy | Yes | Server upload | Server upload | Server upload |
Yes. Unlimited resizes, no signup, no daily cap, no watermark on the output. Resizing happens entirely in your browser, so we have no upload bandwidth to pay for. ResizeImage.net shows ads and pushes a paid plan for batch; we don't.
No. The browser decodes, resizes, and re-encodes every file using the Canvas API. Your photos never leave your device. No server, no log, no temporary storage. Close the tab and the data is gone.
Input: any format your browser can decode (JPEG, PNG, WebP, GIF, BMP, AVIF where supported, even HEIC on iOS Safari). Output: PNG, JPEG, or WebP. PNG keeps transparency; JPEG and WebP let you set quality (1-100).
When you switch from contain to smart-crop mode, portrait images shift the crop toward the upper third of the photo (the rule-of-thirds line where faces tend to land). Center-crop sometimes chops off the top of a head; smart-crop avoids it without needing AI.
Up to about 50MB depending on your device. Mobile browsers cap canvas memory around 30MB pixel data, desktop browsers handle larger. If you see 'browser refused to encode', try a smaller PNG-instead-of-JPEG or a smaller output dimension.
Yes. Drop a folder, paste multiple files, or pick from the file picker. Apply the same dimensions and mode to all of them, then download as a ZIP. The ZIP is built in-browser via JSZip, no server roundtrip.
Yes as of 2026. We track Instagram, Twitter / X, Facebook, LinkedIn, YouTube, TikTok, Pinterest spec changes and refresh the preset library. If a platform changes their ratio, the preset name updates.
Yes. Upload your 1024x1024 master, switch to the App Store presets group, and apply all 10 sizes. ZIP comes back with one PNG per size, ready to drop into Xcode's asset catalog.
Contain fits the image inside the box and may letterbox with a background color. Cover fills the box entirely and crops the image. Fill stretches to exact dimensions and may distort. Smart is cover + a crop bias toward where faces usually live in portraits.
Downsizing is mostly lossless visually because you're throwing away pixels you can't see anyway. Upsizing past the original dimensions does lose quality (the browser has to invent pixels). For best results, never upsize beyond 2x and use PNG for line art / screenshots, JPEG / WebP for photos.
37 presets, four modes, batch with ZIP, browser-only. Free unlimited, no signup.
Open the image resizerThe Image Resizer page is built, reviewed, and maintained by the Molixa team. We use the tool we ship and update the docs when the behavior changes.