head to head · open source
rembg vs thumbnailator
rembg has 25,425 GitHub stars, 2,481 forks, 3 open issues and last shipped 6 days ago. thumbnailator has 5,428 stars, 787 forks, 55 open issues and last shipped 9 months ago. rembg leads on adoption by 368% (25,425 vs 5,428 stars). rembg is written in Python under MIT; thumbnailator is written in Java under MIT. rembg has attracted 10% as many forks as stars, thumbnailator 14%. rembg was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (image-processing), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| rembg | thumbnailator | |
|---|---|---|
| GitHub stars | ★ 25K | ★ 5.4K |
| License | MIT | MIT |
| Written in | Python | Java |
| Last push | 2026-11-06 | 2026-02-17 |
| Forks | ⑂ 2.5K | ⑂ 787 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick rembg if
- You weight community size — 25K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick thumbnailator if
- You want the thumbnailator feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and thumbnailator fits your workflow better
About rembg
Rembg is a tool to remove image backgrounds. It can be used as a CLI, Python library, HTTP server, or Docker container. Sponsors PhotoRoom Remove Background API Fast and accurate background remover API If this project has helped you, please consider making a donation. Requirements bash pip install "rembg[gpu]" for library pip install "rembg[gpu,cli]" for library + cli bash pip install "rembg[rocm]" for library pip install "rembg[rocm,cli]" for library + cli shell rembg help shell rembg help shell curl s rembg i output.png shell rembg i path/to/input.png path/to/output.png shell rembg i path/to/input.png →…
read the full rembg overview →
About thumbnailator
October 1, 2025: Thumbnailator 0.4.21 has been released! See Changes for details. Thumbnailator is now available through Maven! What is Thumbnailator? Thumbnailator is a thumbnail generation library for Java. Why Thumbnailator? Making high quality thumbnails in Java can be a fairly difficult task. Learning how to use the Image I/O API, Java 2D API, image processing, image scaling techniques, ... but fear not! Thumbnailator will take care of all those things for you! Thumbnailator is a single JAR file with no dependencies to external libraries, making development and deployment simple and easy. It is also…
read the full thumbnailator overview →
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Frequently asked questions
Is rembg or thumbnailator more popular?
rembg has 25,425 GitHub stars and thumbnailator has 5,428. rembg has the larger community by that measure.
Are rembg and thumbnailator free?
Both are open source. rembg is licensed under MIT and thumbnailator under MIT. Neither carries a licence fee.
What is the difference between rembg and thumbnailator?
rembg is written in Python and thumbnailator in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, rembg or thumbnailator?
Choose rembg if you want the larger community (25,425 stars) or its MIT licence terms. Choose thumbnailator if its feature set, stack or MIT licence fits better. Both are self-hostable.