What does it cost to convert TIFF to PNG?

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

How large can the TIFF 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 / TIFF to PNG

Convert TIFF to PNG

To convert TIFF to PNG, send one POST to /v1/image-convert with the TIFF 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 TIFF 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.tiff",
  "quality": 80,
  "format": "png"
}

Response

200 OK
payment-response: <base64 settlement receipt>

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

Source file: images/pair-note.tiff, 3.6 KB (3,690 bytes). LZW-compressed TIFF 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, 28% 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 little-endian header points to a first image file directory at byte 3,476 with 15 entries; that directory declares 556 by 100 pixels, 3 samples per pixel and compression LZW. 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

TIFF as a source

TIFF states its byte order in the first four bytes: II followed by an asterisk and a NUL marks a little-endian file, MM followed by a NUL and an asterisk a big-endian one. image-convert and the OCR detector both accept either order. TIFF can wrap several internal compression schemes; Grist does not inspect them and leaves decoding to the bundled libvips loader, refusing with a typed error a file whose pixels will not decode rather than returning a partial result. Before that, the header dimensions are checked against the shared decoded-pixel budget, which is sized so that a high-resolution page scan still fits while a decompression bomb does not. TIFF is read but not written: image-convert's encode enum has no TIFF entry, so on these pages the format appears only as a source.

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 TIFF to PNG?: $0.003 per call, paid in USDC on Base via x402.
How large can the TIFF 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.