
iLovePDF
Smallpdf
PDF24
LlamaPDF
ConverterForAll
OnlineToolHubs
Calculate Pilot
56 free browser-based tools for images, PDFs, videos, and more. No upload, no signup, no limits — your files never leave your device.

Mailflow.sh
Stackmail is a webmail service whereby you can log in to your emails from any browser at any time!

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | convertful.app | stackmail.com |
| Pricing | — | |
| Company | Startup from the United States · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Convertful is a free online file converter with 56+ tools for images, PDFs, videos, and developer utilities. Unlike iLovePDF, Smallpdf, or CloudConvert, everything on Convertful runs entirely in your browser — no files are ever uploaded to a server. Why Convertful? 100% Private — Your files never...
No description of StackMail yet.
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Convertful.app and StackMail.
Convertful.app's answer
Everything runs entirely in the user's browser. Unlike every major competitor (iLovePDF, Smallpdf, CloudConvert), files are never uploaded to a server. This means instant processing, complete privacy, and zero file size restrictions — all powered by WebAssembly and browser APIs.
Convertful.app's answer
Competitors upload your files to their servers, charge $7-21/month for full access, and impose daily limits on free tiers. Convertful processes everything client-side, so it's faster, more private, and completely free. No account required to start using tools.
Convertful.app's answer
Anyone who needs to convert, compress, or edit files quickly — freelancers, designers, developers, students, small business owners, and content creators who value privacy and don't want to pay for basic file operations.
Convertful.app's answer
We got tired of paying monthly subscriptions just to compress a PDF or convert an image. Every competitor uploads your files to their servers, which is slow, expensive to run, and a privacy concern. We realized modern browsers are powerful enough to handle all of this locally — so we built Convertful to prove that file conversion can be free, instant, and private.
Convertful.app's answer
Next.js, React, TypeScript, WebAssembly (FFmpeg for video, Tesseract.js for OCR), Canvas API, Web Crypto API, pdf-lib, Tailwind CSS. Hosted on AWS.
Share your experience with using Convertful.app and StackMail. For example, how are they different and which one is better?
When comparing Convertful.app and StackMail, you can also consider the following products.


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PDF document management and conversion suite
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PDF24 is a free to use PDF creator, converter, and virtual printer.
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Free online file converter with 50+ tools. Merge, split, compress PDFs. Convert images. Extract text with OCR. Everything processes in your browser — files never leave your device. Available in 93 languages.
Compare LlamaPDF to Convertful.app or StackMail:

Experience the next-gen client-side file converter. Our WebAssembly technology processes your documents, images, and video directly inside your browser. No server uploads, zero wait times, and absolute privacy—your files never leave your device.
Compare ConverterForAll to Convertful.app or StackMail: