How It Works
Resize images, videos, and PDFs in four simple steps — completely free, with no uploads and total privacy.
Step 01
Upload Your Files
Drag and drop or click to select files. Images (JPEG, PNG, WebP, AVIF, GIF, SVG, BMP, TIFF), videos (MP4, WebM, MOV, AVI), and PDFs are all supported.
Step 02
Set Your Resize Options
For images: resize by exact pixels, percentage, or longest edge. For videos: choose a target resolution (1080p, 720p, etc.). For PDFs: select a target page size (A4, Letter, custom).
Step 03
Click "Resize"
Your browser processes everything locally — images via the Canvas API, videos via FFmpeg WebAssembly, PDFs via pdf-lib. No data leaves your device.
Step 04
Download Your Files
Download resized files individually or as a ZIP. For images, you can also compare before and after by hovering over thumbnails.
Your Privacy, Guaranteed
HelloResizer is built with privacy as a core principle. All file processing runs locally in your browser — no file is ever uploaded to any server. We don't store, log, or analyse your files in any way. You can even use it offline once the page has loaded.
Frequently Asked Questions
- Do my files get uploaded to a server?
- No. All processing happens entirely in your browser. Images use the Canvas API, videos use FFmpeg compiled to WebAssembly, and PDFs use pdf-lib. Your files are never sent to any server.
- Is there a file size limit?
- Images: 50MB per file. Videos: we recommend under 500MB for smooth processing. PDFs: 100MB per file. Actual limits depend on your device's available memory.
- What file formats are supported?
- Images: JPEG, PNG, WebP, AVIF, GIF, SVG, BMP, TIFF. Videos: MP4, WebM, MOV, AVI. Documents: PDF.
- Will resizing reduce quality?
- For images, downscaling preserves visual quality — you control lossy compression via the quality slider. For videos, downscaling reduces detail proportionally but looks sharp at the new resolution. Audio is preserved unchanged. PDF content is scaled proportionally.
- Can I resize files without losing quality?
- Yes. For images, use PNG output for lossless results, or set the quality slider to 85–95% for lossy formats. For videos, the output is re-encoded at your chosen resolution. For PDFs, all content is preserved and scaled.
- Does it work on mobile?
- Yes. Image and PDF tools work well on all modern mobile browsers. Video resizing works but may be slower on mobile due to higher processing demands.