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QOI File Format

Quite OK Image category

QOI (Quite OK Image) is a 2022 lossless format with a ~200-line spec — PNG-class simplicity that compresses similarly fast.

Typical use: QOI is popular with hobbyist engines and emulators; convert to PNG to view it anywhere.

About the QOI format

QOI (Quite OK Image, 2021) is a lossless format defined in one short specification document: a stream of simple run-length and delta ops over linear pixels. An encoder fits in 300 lines, decodes faster than PNG, and compresses comparably for photographic content.

It has found a home in emulators, demoscene projects and hobby engines — anywhere people want images without a codec dependency. Viewers rarely support it, so converting QOI to PNG is the way to bring these files into normal tools.

Strengths

  • ✓ Radically simple spec (~200 lines)
  • ✓ Lossless with fast decode
  • ✓ No patent or licensing questions

Limitations

  • ✗ Almost no viewer support
  • ✗ Larger than modern codecs for many images
Compression
Lossless (RLE/delta)
Transparency
Supported
Animation
Not supported
Metadata
None
Best for
Hobby engines, lossless simplicity

Convert QOI to…

48 direct directions plus 12 workflows, sorted A–Z; 🔥 marks popular targets.

QOI to AVIF Hot QOI to BMP Hot QOI to CIN QOI to CUR QOI to DCX QOI to DDS QOI to FARBFELD QOI to FITS QOI to GIF Hot QOI to GRAY QOI to GRAYA QOI to HDR QOI to ICO Hot QOI to J2C QOI to J2K QOI to JFIF QOI to JP2 QOI to JPE QOI to JPEG Hot QOI to JPG Hot QOI to JPT QOI to JXL QOI to OTB QOI to PALM QOI to PBM QOI to PCL QOI to PCX QOI to PDF Hot QOI to PFM QOI to PGM QOI to PNG Hot QOI to PNG24 QOI to PNG8 QOI to PNM QOI to PPM QOI to RAS QOI to SIXEL QOI to SVG Hot QOI to SVGZ QOI to TGA QOI to TIF QOI to TIFF Hot QOI to UYVY QOI to VICAR QOI to WebP Hot QOI to XBM QOI to XPM QOI to XV

Cross-engine workflows

QOI to 7Z QOI to APK QOI to JAR QOI to TAR QOI to TAR.BZ2 QOI to TAR.GZ QOI to TAR.XZ QOI to TBZ2 QOI to TGZ QOI to TXZ QOI to WIM QOI to ZIP

Convert other files to QOI…

AVIF to QOI Hot BMP to QOI Hot CIN to QOI CUR to QOI DCX to QOI DDS to QOI FARBFELD to QOI FITS to QOI GeoTIFF to QOI GIF to QOI Hot GRAY to QOI GRAYA to QOI HDR to QOI HEIC to QOI Hot HEIF to QOI ICO to QOI Hot J2C to QOI J2K to QOI JFIF to QOI JP2 to QOI JPE to QOI JPEG to QOI Hot JPG to QOI Hot JPT to QOI JXL to QOI OTB to QOI PALM to QOI PBM to QOI PCL to QOI PCX to QOI PFM to QOI PGM to QOI PNG to QOI Hot PNG24 to QOI PNG8 to QOI PNM to QOI PPM to QOI PSB to QOI PSD to QOI Hot RAS to QOI RAW to QOI Hot SIXEL to QOI SVG to QOI Hot SVGZ to QOI TGA to QOI TIF to QOI TIFF to QOI Hot UYVY to QOI VICAR to QOI WebP to QOI Hot XBM to QOI XPM to QOI XV to QOI

Frequently asked questions

What is a QOI file?

QOI (Quite OK Image) is a 2022 lossless format with a ~200-line spec — PNG-class simplicity that compresses similarly fast.

How do I convert QOI files online?

Pick a target format from the "Convert QOI to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert QOI files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can QOI convert to?

This page lists all 60 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.