What does it cost to convert AVIF to PNG?

$0.003 per call, paid in USDC on Base via x402.

How large can the AVIF file be?

Up to 25 MB (26,214,400 bytes). Past a limit the call answers too_large (413).

What happens if the conversion fails?

The tool answers with a typed JSON error from the errors table. Payment is settled only after the tool has produced its result; a call that fails inside the tool is never settled.

catalogue / tools / Images / AVIF to PNG

Convert AVIF to PNG

To convert AVIF to PNG, send one POST to /v1/image-convert with the AVIF source and "format": "png" in the body. Each call costs $0.003 in USDC on Base via x402, with no account and no API key. The source file can be up to 25 MB.

Endpoint: POST /v1/image-convert
Price: $0.003 per call
Service: image-convert
Docs: /docs/image-convert

01Limits

Limit	Value
Largest source file	25 MB (26,214,400 bytes)
Timeout	60 s
Source formats	AVIF, GIF, JPEG, PNG, SVG, TIFF, WebP
Output formats	JPEG, PNG, WebP
Option quality	default 80

02Example

A real AVIF to PNG run of image-convert.

Request

POST /v1/image-convert
content-type: application/json
payment-signature: <base64 x402 payload>

{
  "url": "https://grist.tools/samples/images/pair-note.avif",
  "quality": 80,
  "format": "png"
}

Response

200 OK
payment-response: <base64 settlement receipt>

{
  "source_url": "https://grist.tools/samples/images/pair-note.avif",
  "source_format": "avif",
  "format": "png",
  "mime_type": "image/png",
  "width": 556,
  "height": 100,
  "bytes": 1021,
  "image_base64": "iVBORw0KGgoAAAANSUhEUgAAAiwAAABkCAIAAAAqgfyWAAAACXBIWXMAAAPoAAAD..."
}

Source file: images/pair-note.avif, 1 KB (1,029 bytes). Lossless AVIF of the same 556x100 raster as ocr-scan.png: two uppercase lines drawn from a hand-written 5x7 bitmap font, SAMPLE SCAN FOR OCR and SECOND LINE 2026. The request sets quality to 80. The recorded run returned 1,021 bytes of PNG, 99% of the source size, with an image of 556x100 pixels. Decoded, the PNG in image_base64 opens with 89 50 4E 47 0D 0A 1A 0A 00 00 00 0D (ASCII PNG).

In the sample itself, the ftyp box names major brand avif, minor version 0 and compatible brands mif1, avif and miaf; the top-level boxes run ftyp, meta and mdat; its ispe property gives an image of 556 by 100 pixels; the primary item is coded as av01. In the returned PNG: its IHDR chunk declares 556 by 100 pixels, 8-bit truecolour RGB and no interlacing. The next chunk is pHYs.

03Format notes

AVIF as a source

AVIF images live inside an ISO base-media file. Grist reads the ftyp box marker at byte four and accepts the avif or avis brand at byte eight. Without that brand test the media sniffer, which looks only for ftyp, would take the same bytes for an MP4 container. Decoding goes through the heif loader compiled into the bundled libvips, and the recorded AVIF conversion examples show a full decode through it. HEIC uses the same container family and loader but has no page here, because no real HEIC has been decoded in this project and HEVC support differs between libheif builds. AVIF reaches image-convert only, since the OCR detector has no AVIF signature. The encoder cannot write AVIF either, so the format appears purely as a source whose decoded pixels are re-encoded, with metadata dropped.

PNG as a target

PNG output is lossless, so image-convert ignores the quality value when PNG is requested. Its encoder options are pinned: the maximum zlib compression level, a fixed effort, adaptive filtering off, palette quantisation off and no interlacing, so identical pixels always deflate to identical bytes. Dimensions are kept and reported in the response, and metadata is stripped. Vector input takes a separate service: svg-to-png renders the document at a caller-set density, which drives the natural raster size, and an optional width or height fits the render inside that box with the lanczos3 kernel, keeping the aspect ratio, before the same pinned PNG options apply. video-thumbnail writes PNG by default through ffmpeg's png encoder; when a width is requested, the height follows the aspect ratio and is rounded to an even number.

04Errors

Code	HTTP
`invalid_input`	`400`
`blocked_target`	`403`
`unreachable_target`	`424`
`upstream_timeout`	`424`
`unsupported_content_type`	`415`
`too_large`	`413`
`unprocessable`	`422`
`internal`	`500`

When each is raised, and what it means for payment: /docs/image-convert.

05Questions

What does it cost to convert AVIF to PNG?: $0.003 per call, paid in USDC on Base via x402.
How large can the AVIF file be?: Up to 25 MB (26,214,400 bytes). Past a limit the call answers too_large (413).
What happens if the conversion fails?: The tool answers with a typed JSON error from the errors table. Payment is settled only after the tool has produced its result; a call that fails inside the tool is never settled.