What rotation angles can I use on an AVIF?

90°, 180°, and 270° are the clean cases — the pixel grid is simply transposed or reversed, with no interpolation. Any custom integer angle (e.g. 5°, 17°, 45°) is also accepted, but those involve resampling the pixel grid and revealing triangular corners that fill with a background color. For correcting sideways photos, stick to 90 / 180 / 270; for straightening horizons, use a small custom angle.

Will rotating my AVIF reduce quality?

A 90°/180°/270° rotation is a geometric transform with no interpolation, so the only quality cost is the re-encode itself. Pick the Highest quality preset or Image Quality 95-100 to make the re-encode visually lossless. (AVIF, like WebP, does not currently support truly lossless rotation via metadata-only operations the way jpegtran does for JPEG — the AV1 bitstream needs to be re-emitted.) For pixel-perfect re-encoding, AVIF supports a lossless mode at quality 100.

Why does my AVIF look correct in Chrome but sideways in another viewer?

AVIF carries two orientation signals: the HEIF irot transform property and the EXIF Orientation tag. Per the Mozilla bug tracker and an analysis by Tuomas Siipola, Chrome and Firefox prefer irot and may ignore EXIF Orientation in AVIF, while other viewers (older OS image previewers, some Linux desktop viewers) only check EXIF. If the two signals disagree, the image flips depending on the viewer. Physically rotating the pixels eliminates the ambiguity.

Does this tool fix EXIF Orientation, or actually rotate the pixels?

It rotates the pixels. After rotation, the output is re-encoded with the corrected pixel grid and the orientation tag reset to "1" (no rotation needed). That means the file looks the same in every browser, every preview pane, and every CMS regardless of how each one interprets irot or EXIF tags.

Will rotation preserve alpha transparency and HDR metadata?

Alpha channels survive rotation — AVIF's alpha plane rotates with the color planes. HDR metadata (transfer function, color primaries, mastering display info) is preserved when the re-encoder keeps the same 10- or 12-bit depth and BT.2020 primaries as the source. Drop to 8-bit only if you're targeting older browsers or smaller files, since that step is what loses HDR information.

Can I batch rotate multiple AVIF files with different angles?

You can batch with a single shared angle in one upload. For mixed angles (some need 90°, some need 180°), upload each group separately. The processor handles each file independently, so a 50-image batch finishes faster than 50 single uploads.

Why is the rotated AVIF a different file size from the original?

Re-encoding a rotated image rarely produces a byte-identical AV1 bitstream even at quality 100 — entropy coding works on transformed blocks, and rotating the pixel grid changes which patterns the encoder sees. Expect ±10-30% size variation versus the input. To keep size predictable, use the "Target file size %" option to cap the output relative to the input.

Should I rotate before or after converting to another format?

Rotate first if the destination format has weaker orientation-tag support than AVIF (most non-JPEG cases). After converting to JPG, PNG, or WebP, some metadata may be stripped depending on the converter — so locking the orientation into the pixels beforehand is the safest path. For a single tool round-trip, you can also rotate during conversion if the converter exposes both controls.

How is this different from rotating a HEIC or JPG?

AVIF and HEIC share the same HEIF container, so both have access to the irot rotation property — see HEIC rotation for the iPhone side. JPEG only has EXIF Orientation, but supports truly lossless rotation via jpegtran-style DCT block swapping, which AVIF cannot do without re-encoding the AV1 bitstream. In practice all three "feel" lossless at top quality, but JPEG is uniquely byte-lossless for 90° turns.

Rotate AVIF

Rotate AVIF images to the correct orientation and export as AVIF. Adjust quality, resolution, and batch process multiple files — free with no watermarks.

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