Open-source PDF platform to edit, convert, OCR, sign, redact, and automate PDF workflows via a web UI and REST API.
88.2k stars7.8k forkslast commit Actively maintained
10 self-hosted ConvertAPI alternatives
Cloud REST API that converts documents, images and other file formats (PDF, Office, HTML, images). Provides programmatic endpoints for conversion, compression, resizing and basic file processing to integrate format transformations into applications and workflows.
Alternatives to ConvertAPI
#2
ConvertX is a self-hosted web file converter supporting 1000+ formats across documents, images, audio/video, ebooks, and 3D assets, with multi-file processing and accounts.
18.1k stars1k forksAGPL-3.0last commit Actively maintained
#3
Self-hostable, privacy-first PDF toolkit that runs fully in the browser for editing, merging, converting, and processing PDFs without server-side uploads.
14.4k stars1.2k forksAGPL-3.0last commit Actively maintained
Gotenberg is a containerized HTTP API that converts HTML, Markdown, and Office documents to PDF using engines like Chromium and LibreOffice, with options to merge and automate outputs.
12.7k stars821 forksMITlast commit Actively maintained
#5
Fast, security-focused image processing server to resize, transform, optimize, and convert images on demand via URL-based HTTP requests.
11k stars760 forksApache-2.0last commit Actively maintained
#6
Thumbor is an open-source image processing server for on-demand resizing, smart cropping, format conversion, and filter pipelines via URL-based HTTP requests.
10.5k stars865 forksMITlast commit Actively maintained
#7
Self-hosted image optimizer that compresses and converts images locally in your browser, works offline, and keeps files private with on-device processing.
2.7k stars136 forksGPL-3.0last commit Actively maintained
#8
Dockerized image processing service that fetches, resizes, crops, compresses, caches, and serves optimized images (AVIF, WebP, MozJPEG, PNG, GIF, optional JXL).
1.2k stars121 forksAGPL-3.0last commit Actively maintained
Self-hosted web UI for file conversion, OCR for PDFs/images, and local Whisper-based audio transcription, wrapping common CLI tools with background jobs and history.
950 stars57 forksMITlast commit Slowing down
#10
Go-based self-hosted web archiver for personal/home use. Saves pages as PDF, captures HTTP headers, and stores single-file HTML. Provides a REST API and optional web UI.
195 stars5 forksBSD-3-Clauselast commit Slowing down
What replacing ConvertAPI actually involves
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 8 of 10 shipped a commit in the last six months. Licences in this list: AGPL-3.0, MIT, Apache-2.0, GPL-3.0, BSD-3-Clause. In exchange you take on hosting, backups and updates yourself.
Browse everything in Document Processing & PDF Tools.
