Supported formats

11 formats today. Where a format can only be read, we say so — you'll never hit a dead end after dropping a file.

Web & Common

PNG

W3C, 1996

Screenshots, logos, graphics with transparency

Read: native
Write: native (canvas.toBlob) + lossless optimization
Transparency: Yes
Animation: No
Compression: Lossless
Typical size: Large — lossless
Browsers: Universal

Compress PNG Convert PNG

JPG

JPEG committee, 1992

Photographs where file size matters

Read: native
Write: native
Transparency: No
Animation: No
Compression: Lossy
Typical size: Small to medium
Browsers: Universal

Compress JPG Convert JPG

JFIF

C-Cube Microsystems, 1992

JPEG files saved with the JFIF container extension

Read: native (JPEG bytes)
Write: native (JPEG bytes)
Transparency: No
Animation: No
Compression: Lossy
Typical size: Same as JPG
Browsers: Universal

Compress JFIF Convert JFIF

WEBP

Google, 2010

The best all-round balance for the web

Read: native
Write: native
Transparency: Yes
Animation: Yes
Compression: Lossy or lossless
Typical size: 25–35% smaller than PNG/JPG
Browsers: All modern browsers

Compress WEBP Convert WEBP

AVIF

Alliance for Open Media, 2019

The smallest possible web files

Read: native
Write: native, with a built-in WASM encoder as fallback
Transparency: Yes
Animation: Yes
Compression: Lossy or lossless
Typical size: Smallest
Browsers: Chrome, Firefox, Safari 16+

AVIF export works in every browser — where the browser can't encode it, Under1MB uses its own encoder, which takes a few seconds longer.

Compress AVIF Convert AVIF

GIF

CompuServe, 1987

Short loops and simple animations

Read: native (first frame only)
Write: Not supported
Transparency: Yes
Animation: Yes
Compression: Lossless
Typical size: Large for what it shows
Browsers: Universal

GIF converts from its first frame.

Convert GIF

BMP

Microsoft, 1986

Raw uncompressed bitmaps, legacy software

Read: native
Write: built-in 24/32-bit BMP encoder
Transparency: Yes
Animation: No
Compression: Lossless
Typical size: Very large
Browsers: Universal

Compress BMP Convert BMP

ICO

Microsoft, 1985

Favicons and Windows icons

Read: native
Write: built-in ICO wrapper around PNG
Transparency: Yes
Animation: No
Compression: Lossless
Typical size: Tiny
Browsers: Universal (favicons)

ICO export is capped at 256px, ideal for favicons.

Compress ICO Convert ICO

Photo & Professional

HEIC

MPEG / Apple, 2017

iPhone photos at half the size of JPG

Read: libheif (WASM), native on Safari
Write: Not supported
Transparency: No
Animation: No
Compression: Lossy
Typical size: Small for the quality
Browsers: Apple devices natively

Convert HEIC

HEIF

MPEG, 2015

High-efficiency photos from modern cameras

Read: libheif (WASM), native on Safari
Write: Not supported
Transparency: No
Animation: No
Compression: Lossy
Typical size: Small for the quality
Browsers: Apple devices natively

Convert HEIF

Design Files

SVG

W3C, 2001

Logos and icons that scale forever

Read: native via sandboxed <img>
Write: Not supported
Transparency: Yes
Animation: No
Compression: Lossless
Typical size: Tiny
Browsers: Universal

SVG is rasterized at the size you choose.

Convert SVG

Coming soon

Not supported yet — we'd rather say so than fail after you drop a file.

TIFF · TGA · PSD · PSB · CR2 · CR3 · NEF · ARW · DNG · ORF · RAF · RW2 · XCF · ICNS · PUB

Your images. Your device. Your privacy.

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