qkconvert

QkConvert Plugin for Claude

File conversion API plugin — convert images, audio, documents, and data formats directly from Claude Code and Cowork. Try it in the sandbox — 20 requests/day, no signup required.

Install

1. Add the marketplace:

/plugin marketplace add Necromunger/qkconvert-plugin

2. Install the plugin:

/plugin install qkconvert@qkconvert-plugin

3. Set your API key:

Sign up free at qkconvert.dev (Google, GitHub, or email), then create an API key in the dashboard.

Claude Code (Mac/Linux) — add to your shell config (.bashrc, .zshrc):

export QKCONVERT_API_KEY=sk_live_...

Claude Code (Windows) — run in CMD or PowerShell (persists across sessions):

setx QKCONVERT_API_KEY sk_live_...

Cowork — set in the plugin's environment configuration when prompted during install, or via Settings > Plugins > QkConvert > Environment Variables.

The plugin reads QKCONVERT_API_KEY from the environment and passes it as Authorization: Bearer to all API calls.

No key yet? Try the sandbox first — 20 free requests per day with no signup.

Skills

6 skills covering all 64 API endpoints. All endpoints must be called via curl (as the skills do), not by invoking the MCP tools directly - the OpenAPI-to-MCP bridge cannot transmit multipart/form-data bodies, so direct tool calls arrive with empty content regardless of whether you pass a file path or inline data. The MCP tools are exposed for discovery and documentation only.

Skill	What it does	Credits	Endpoints covered
/convert-image	Convert, resize, optimize, watermark, strip EXIF, thumbnails, QR codes, barcodes, OCR, batch ops, blurhash, GIF, crop	1	18
/convert-audio	Convert, trim, merge, split, normalize volume, generate waveform	3	7
/process-document	Merge, split, compress, watermark, extract text, render to image, create PDF, protect, office-to-pdf	2	11
/convert-data	Convert between CSV, JSON, XML, YAML, XLSX, TOML + Markdown to HTML	1	25
/hash-file	Compute MD5, SHA-1, SHA-256, SHA-512, CRC32 for any file	1	1
/archive	Create ZIP archives, inspect ZIP contents	2	2

Total: 64 endpoints across 7 categories - see the OpenAPI spec for the full inventory.

Output Files

All skills save output files to the current working directory by default, using the original filename with the new extension (e.g. photo.png → photo.webp). If a file with that name already exists, the skill will ask before overwriting.

Skills are manually chainable — run one, then reference the output path in the next:

/convert-image photo.tiff to png
/hash-file photo.png sha256

Automatic piping between skills is not currently supported — each skill runs as an independent API call.

Examples

Image conversion with options:

/convert-image photo.png to webp at quality 85, resize to 800px wide

Trim an audio clip:

/convert-audio podcast.mp3 trim from 1:30 to 5:45, output as wav

Merge PDFs:

/process-document merge chapter1.pdf chapter2.pdf chapter3.pdf

Convert a spreadsheet to JSON:

/convert-data sales.xlsx to json, pretty-printed

Verify file integrity:

/hash-file release.zip sha256

Pricing

Plan	Monthly	Credits	Rate limit	Overage
Free	$0	500/mo	5 RPM	Hard cap
Hobby	$6	1,000/mo	30 RPM	$0.006/credit
Starter	$15	5,000/mo	60 RPM	$0.003/credit
Pro	$60	50,000/mo	300 RPM	$0.002/credit

Credit costs by category:

Category	Credits	Endpoints
Images (convert, resize, optimize, watermark, QR, barcode, EXIF, thumbnails, metadata, OCR, batch ops, blurhash, GIF, crop)	1	18
Data (CSV, JSON, XML, YAML, XLSX, TOML, Markdown — 25 conversion pairs)	1	25
File utilities (hash/checksum)	1	1
Documents (merge, split, compress, watermark, text, to-image, from-images, text-to-pdf, metadata, protect, office-to-pdf)	2	11
Archives (ZIP create, ZIP inspect)	2	2
Audio (convert, trim, merge, split, normalize, waveform, metadata)	3	7

Free tier: 500 credits total per month across all categories. For example, 500 image conversions, or 166 audio conversions, or any mix.

Limits

• Max file size: 10 MB (authenticated), 2 MB (sandbox)
• Supported image input: JPEG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO, SVG
• Supported audio input: MP3, WAV, FLAC, OGG, AAC, AIFF
• Audio output: MP3, WAV, FLAC only
• Documents: PDF only
• Archives: ZIP only

Error Reference