Best.Free API — for developers

Automate any tool from your own code. Every interactive tool exposes a single POST endpoint that returns exactly what the web app produces.

No key to start

POST and go. Rate-limited per IP; sign in later for higher limits.

Same as the web app

The endpoint runs the identical processor — same output, no surprises.

In-memory, private

Files are processed in memory and never stored on disk.

Quick start

Send a POST to any tool endpoint below. JSON-mode tools take a JSON body; file tools take multipart form-data. The response is the finished file or a JSON result.

Endpoints (45)

https://best.free/api/tools/pdf-annotator/ open tool → 
curl -X POST https://best.free/api/tools/pdf-annotator/ \
  -F 'file=@document.pdf' \
  -F 'type=note' \
  -F 'text=Please review this section' \
  -F 'page=1' \
  -F 'x=72' \
  -F 'y=72' \
  -o annotated.pdf

https://best.free/api/tools/audio-converter/ open tool → 
curl -X POST https://best.free/api/tools/audio-converter/ \
  -F 'file=@track.wav' \
  -F 'format=mp3' \
  -o audio.mp3

https://best.free/api/tools/background-remover/ open tool → 
curl -X POST https://best.free/api/tools/background-remover/ \
  -F 'file=@portrait.jpg' \
  -o no-background.png

https://best.free/api/tools/barcode-generator/ open tool → 
curl -X POST https://best.free/api/tools/barcode-generator/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "0123456789012", "symbology": "code128"}'

https://best.free/api/tools/csv-to-json/ open tool → 
curl -X POST https://best.free/api/tools/csv-to-json/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "name,age\\nAda,36", "delimiter": ",", "header": true}'

https://best.free/api/tools/case-converter/ open tool → 
curl -X POST https://best.free/api/tools/case-converter/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "hello world from best free"}'

https://best.free/api/tools/compress-pdf/ open tool → 
curl -X POST https://best.free/api/tools/compress-pdf/ \
  -F 'file=@document.pdf' \
  -o compressed.pdf

https://best.free/api/tools/image-crop/ open tool → 
curl -X POST https://best.free/api/tools/image-crop/ \
  -F 'file=@photo.jpg' \
  -F 'x=0' \
  -F 'y=0' \
  -F 'width=400' \
  -F 'height=300' \
  -o cropped.png

https://best.free/api/tools/currency-converter/ open tool → 
curl -X POST https://best.free/api/tools/currency-converter/ \
  -H 'Content-Type: application/json' \
  -d '{"amount": 100, "from": "USD", "to": "EUR"}'

https://best.free/api/tools/document-converter/ open tool → 
curl -X POST https://best.free/api/tools/document-converter/ \
  -F 'file=@document.docx' \
  -F 'format=pdf' \
  -o document.pdf

https://best.free/api/tools/ebook-converter/ open tool → 
curl -X POST https://best.free/api/tools/ebook-converter/ \
  -F 'file=@book.mobi' \
  -F 'format=epub' \
  -o book.epub

https://best.free/api/tools/favicon-maker/ open tool → 
curl -X POST https://best.free/api/tools/favicon-maker/ \
  -F 'file=@logo.png' \
  -o favicons.zip

https://best.free/api/tools/image-compressor/ open tool → 
curl -X POST https://best.free/api/tools/image-compressor/ \
  -F 'file=@photo.jpg' \
  -F 'quality=70' \
  -F 'format=jpg' \
  -o compressed.jpg

https://best.free/api/tools/image-converter/ open tool → 
curl -X POST https://best.free/api/tools/image-converter/ \
  -F 'file=@photo.jpg' \
  -F 'format=png' \
  -o image.png

https://best.free/api/tools/image-enhancer/ open tool → 
curl -X POST https://best.free/api/tools/image-enhancer/ \
  -F 'file=@photo.jpg' \
  -F 'contrast=1.1' \
  -F 'color=1.15' \
  -o enhanced.png

https://best.free/api/tools/image-metadata/ open tool → 
curl -X POST https://best.free/api/tools/image-metadata/ \
  -F 'file=@photo.jpg' \
  -F 'action=read' \
  -o metadata.json

https://best.free/api/tools/image-optimizer/ open tool → 
curl -X POST https://best.free/api/tools/image-optimizer/ \
  -F 'file=@photo.jpg' \
  -o optimized.jpg

https://best.free/api/tools/image-resizer/ open tool → 
curl -X POST https://best.free/api/tools/image-resizer/ \
  -F 'file=@photo.jpg' \
  -F 'width=800' \
  -F 'height=600' \
  -F 'keep_aspect=True' \
  -o resized.png

https://best.free/api/tools/image-sharpener/ open tool → 
curl -X POST https://best.free/api/tools/image-sharpener/ \
  -F 'file=@photo.jpg' \
  -F 'amount=150' \
  -F 'radius=2' \
  -o sharper.png

https://best.free/api/tools/image-vectorizer/ open tool → 
curl -X POST https://best.free/api/tools/image-vectorizer/ \
  -F 'file=@logo.png' \
  -F 'mode=color' \
  -o image.svg

https://best.free/api/tools/invoice-generator/ open tool → 
curl -X POST https://best.free/api/tools/invoice-generator/ \
  -H 'Content-Type: application/json' \
  -d '{"from": "Acme LLC", "to": "Client Co", "invoice_number": "INV-001", "items": "Design work | 10 | 75", "tax_rate": 8.5, "currency": "$"}'

https://best.free/api/tools/jpg-to-pdf/ open tool → 
curl -X POST https://best.free/api/tools/jpg-to-pdf/ \
  -F 'files=@photo1.jpg' \
  -F 'files=@photo2.jpg' \
  -o images.pdf

https://best.free/api/tools/json-formatter/ open tool → 
curl -X POST https://best.free/api/tools/json-formatter/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "{\"b\":2,\"a\":1}", "action": "format", "indent": 2, "sort": true}'

https://best.free/api/tools/json-to-csv/ open tool → 
curl -X POST https://best.free/api/tools/json-to-csv/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "[{\"name\":\"Ada\",\"age\":36}]"}'

https://best.free/api/tools/merge-pdf/ open tool → 
curl -X POST https://best.free/api/tools/merge-pdf/ \
  -F 'files=@file1.pdf' \
  -F 'files=@file2.pdf' \
  -o merged.pdf

https://best.free/api/tools/pdf-organizer/ open tool → 
curl -X POST https://best.free/api/tools/pdf-organizer/ \
  -F 'file=@document.pdf' \
  -F 'pages=3,1,2' \
  -F 'rotate=1:90,3:180' \
  -o organized.pdf

https://best.free/api/tools/pdf-form-filler/ open tool → 
curl -X POST https://best.free/api/tools/pdf-form-filler/ \
  -F 'file=@form.pdf' \
  -F 'fields={"full_name": "Jane Doe", "date": "2026-06-27"}' \
  -o filled.pdf

https://best.free/api/tools/pdf-to-excel/ open tool → 
curl -X POST https://best.free/api/tools/pdf-to-excel/ \
  -F 'file=@report.pdf' \
  -o tables.xlsx

https://best.free/api/tools/pdf-to-jpg/ open tool → 
curl -X POST https://best.free/api/tools/pdf-to-jpg/ \
  -F 'file=@document.pdf' \
  -F 'dpi=150' \
  -o pages-jpg.zip

https://best.free/api/tools/pdf-to-ppt/ open tool → 
curl -X POST https://best.free/api/tools/pdf-to-ppt/ \
  -F 'file=@document.pdf' \
  -F 'dpi=150' \
  -o slides.pptx

https://best.free/api/tools/pdf-to-word/ open tool → 
curl -X POST https://best.free/api/tools/pdf-to-word/ \
  -F 'file=@document.pdf' \
  -o document.docx

https://best.free/api/tools/password-generator/ open tool → 
curl -X POST https://best.free/api/tools/password-generator/ \
  -H 'Content-Type: application/json' \
  -d '{"length": 20, "count": 5, "upper": true, "lower": true, "digits": true, "symbols": true}'

https://best.free/api/tools/ppt-to-pdf/ open tool → 
curl -X POST https://best.free/api/tools/ppt-to-pdf/ \
  -F 'file=@deck.pptx' \
  -o slides.pdf

https://best.free/api/tools/qr-code-generator/ open tool → 
curl -X POST https://best.free/api/tools/qr-code-generator/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "https://best.free", "size": 10, "ec": "M"}'

https://best.free/api/tools/resume-builder/ open tool → 
curl -X POST https://best.free/api/tools/resume-builder/ \
  -H 'Content-Type: application/json' \
  -d '{"name": "Ada Lovelace", "title": "Software Engineer", "email": "ada@example.com", "summary": "Backend engineer with 8 years experience.", "experience": "Senior Engineer, Acme (2020-2026)", "education": "BSc Computer Science", "skills": "Python, Django, PostgreSQL"}'

https://best.free/api/tools/image-rotate/ open tool → 
curl -X POST https://best.free/api/tools/image-rotate/ \
  -F 'file=@photo.jpg' \
  -F 'angle=90' \
  -F 'flip=none' \
  -o rotated.png

https://best.free/api/tools/svg-to-png/ open tool → 
curl -X POST https://best.free/api/tools/svg-to-png/ \
  -F 'file=@image.svg' \
  -F 'format=png' \
  -F 'scale=1' \
  -o image.png

https://best.free/api/tools/pdf-sign/ open tool → 
curl -X POST https://best.free/api/tools/pdf-sign/ \
  -F 'file=@contract.pdf' \
  -F 'signature=@signature.png' \
  -F 'text=Jane Doe' \
  -F 'page=1' \
  -F 'x=350' \
  -F 'y=680' \
  -F 'width=160' \
  -o signed.pdf

https://best.free/api/tools/split-pdf/ open tool → 
curl -X POST https://best.free/api/tools/split-pdf/ \
  -F 'file=@document.pdf' \
  -F 'pages=1-3,5' \
  -F 'mode=extract' \
  -o split.pdf

https://best.free/api/tools/url-shortener/ open tool → 
curl -X POST https://best.free/api/tools/url-shortener/ \
  -H 'Content-Type: application/json' \
  -d '{"url": "https://example.com/a/very/long/path"}'

https://best.free/api/tools/unit-converter/ open tool → 
curl -X POST https://best.free/api/tools/unit-converter/ \
  -H 'Content-Type: application/json' \
  -d '{"category": "length", "value": 10, "from": "mi", "to": "km"}'

https://best.free/api/tools/pdf-unlock/ open tool → 
curl -X POST https://best.free/api/tools/pdf-unlock/ \
  -F 'file=@protected.pdf' \
  -F 'action=remove' \
  -F 'password=currentpass' \
  -F 'new_password=newpass' \
  -o unlocked.pdf

https://best.free/api/tools/video-converter/ open tool → 
curl -X POST https://best.free/api/tools/video-converter/ \
  -F 'file=@clip.mov' \
  -F 'format=mp4' \
  -o video.mp4

https://best.free/api/tools/word-counter/ open tool → 
curl -X POST https://best.free/api/tools/word-counter/ \
  -H 'Content-Type: application/json' \
  -d '{"text": "Paste any text here to count it."}'

https://best.free/api/tools/archive-zip/ open tool → 
curl -X POST https://best.free/api/tools/archive-zip/ \
  -F 'files=@file1.txt' \
  -F 'files=@file2.txt' \
  -F 'level=6' \
  -F 'name=archive' \
  -o archive.zip

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