Features
Everything Graviton does, on your own device
Compress, convert, crop and resize images right in your browser. Your photos are never uploaded, both plans include every feature, and most photos are done in about a second.
How Graviton works, feature by feature
Graviton runs open-source image encoders inside your browser. Each page below explains one part of it in detail, with the facts and limits that apply.
- PrivacyPrivacy and security: your images never leave your deviceImages are compressed in your browser and never uploaded. See exactly what our server receives when you download (only a one-way fingerprint, which is never stored) and how to check it yourself in your browser’s network tab.Read more
- Compress to an exact file sizeType 50 KB or 2 MB and Graviton finds the highest quality that fits at the original width and height, or shrinks the dimensions if you allow it.
- Image qualityMozJPEG, libwebp, libavif and OxiPNG make files up to 90% smaller while keeping them sharp. You get your original back if it can’t be improved.
- Crop and resizeCrop to any shape on the image itself, and resize by dragging or typing pixels, for one photo or a whole batch.
- Advanced controlsFormat, quality, exact and minimum file size, crop, resize, lossless, metadata and print resolution: what each setting does, its default, and when to change it.
- Format conversionOpen JPG, PNG, WebP, AVIF, GIF and iPhone HEIC files. Save as JPG, PNG, WebP or AVIF, with transparency kept where the format allows.
- Bulk compressionCompress up to 250 images or whole folders at once and review every result. Download them one by one or as a ZIP that keeps your folders: 3 a day on Free, unlimited on Pro.
- Fast compressionWork runs in parallel on your processor’s cores, with no upload or download wait. Most photos are done in about a second.
At a glance
What every account includes
Compressing is free, unlimited and needs no account. Downloading needs a free account, and Pro only removes the daily download limit.
| Feature | Details |
|---|---|
| Where images are processed | In your browser, by WebAssembly encoders running in Web Workers |
| Images uploaded | None. When you download, our server receives only a one-way fingerprint of each image, and stores none of it. |
| Formats you can open | JPG, PNG, WebP, AVIF, GIF and HEIC/HEIF from iPhones |
| Formats you can save | JPG, PNG, WebP and AVIF. Animated GIFs can stay GIFs with every frame. |
| Settings | Format, quality from 5 to 100, exact file size in KB or MB with an optional minimum, crop, resize, lossless, Keep HDR, Keep metadata and print resolution |
| Largest image | 100 MB and 120 megapixels |
| Images per batch | Up to 250, from files or whole folders, downloaded one by one or as a ZIP that keeps the folders |
| Downloads a day | 3 on Free, resetting at midnight UTC; unlimited on Pro. Compressing is always unlimited. Compare plans |
| Popular tools | HEIC to JPG, compress to 100 KB, resize an image and every other tool |
Try it on your own photos
Compress as many images as you like, no account needed. A free account includes 3 downloads a day, with every feature, and Pro removes the limit.
Compress an image