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PDF24 - Online PDF Tools
169 free tools for PDFs, images, text and everyday maths that run entirely in your browser, so your files are never uploaded to a server.

Pandas
NumPy
OpenCV
Dataiku
Exploratory
WEKA
htm.java
scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.

Which is more popular?
Based on our record, Scikit-learn seems to be more popular. It has been mentioned 41 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | orpheustools.app | scikit-learn.org |
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| Company | Startup from Pakistan · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Orpheus is a collection of 169 free web tools: PDF merging, splitting, watermarking and page numbering; image conversion, compression, cropping and favicon generation; JSON, regex, cron, SQL and encoding utilities; and 96 calculators and unit converters. What makes it different is where the work...
No description of Scikit-learn yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


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As answered by people managing OrpheusTools.app and Scikit-learn.
OrpheusTools.app's answer
Every other online file converter uploads your document to a server, processes it there and sends it back. Orpheus does the work in the browser: the file is read into memory on your own machine, processed with WebAssembly and the browser's own codecs, and handed straight back. No file is transmitted, and you can verify that rather than trust it — open the network tab and watch it stay empty while a tool runs. There is no account, no queue, no watermark and no file size limit.
OrpheusTools.app's answer
Three reasons. Privacy is structural rather than a policy: there is no server holding your file, so there is no retention promise to trust. Breadth: 169 tools covering PDF, image, text, developer utilities and 96 calculators, so one site replaces several. And speed: with no upload and no download round trip, a 30 MB PDF is finished in less time than the upload alone would take. Pages hold LCP under a second on a throttled mobile connection.
OrpheusTools.app's answer
People handling documents they would rather not hand to a third party: contracts, CVs, medical letters, bank statements, passport photos. In practice that is a wide group — students, freelancers, small businesses, developers, and anyone who has hit a file size paywall on a free converter. The site is built mobile-first, because people convert a file on the device it is already on.
OrpheusTools.app's answer
It started from noticing that every mainstream online converter receives your file, and that for the documents people actually convert — a signed contract, a CV, a scan of an ID — that is a bad trade for a thirty-second task. The browser turned out to be far more capable than expected: createImageBitmap and OffscreenCanvas already handle the JPEG/PNG/WebP triangle with no library at all, and pdf-lib handles PDFs inside a Web Worker. Everything grew from there to 169 tools and 43 guides, each one a single config file checked by a build gate.
OrpheusTools.app's answer
Next.js 16 with the App Router, statically exported — every page is prerendered, there is no server and no cold start, and the site is served as assets from Cloudflare. Processing runs in Web Workers: createImageBitmap and OffscreenCanvas for JPEG, PNG and WebP, WebAssembly for formats the browser cannot decode natively, and pdf-lib for PDFs, loaded as its own chunk so it arrives only when you click the button. TypeScript throughout, in a pnpm workspace.
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Scikit-learn is an open source machine learning library for Python that's built on the SciPy and NumPy scientific computing libraries, plus Matplotlib for plotting data. It supports both supervised and unsupervised...
Recommendations tracked on public social media and blogs since March 2021.


Tracking OrpheusTools.app since Aug 2026.
Reachability says who could be compromised. Behavior says who probably is. Sysmon Event ID 1 records every process with its parent. Reduce each to a parent>child token, keep only tokens that are new to each host since the intrusion... - Source: dev.to / about 1 month ago
Certutil.exe or notepad.exe opening an external connection lands in rare because, fleet-wide, those processes almost never egress. Tune the <= 3 threshold to your environment size. For a more principled version, score each (process,... - Source: dev.to / 5 months ago
Pre-configured environment. A working VM or container with Jupyter, pandas, scikit-learn, and transformers already installed. Realistic security datasets loaded. GTK Cyber students work in the Centaur VM, a free Apache 2.0 portable lab.... - Source: dev.to / 6 months ago
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