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Firma Total
Sign PDFs locally with visible signatures or PAdES
Firma Total is a free, privacy-first PDF signing tool that works locally in your browser. Add visible signatures, create verifiable PAdES signatures withp12/.pfx certificates, or use AutoFirma—without uploads, accounts, subscriptions or usage limits.
Hi Product Hunt!
I’m the maker behind Chapa Lab. I built Firma Total because signing a PDF should not require uploading a sensitive document to someone else’s server.
Firma Total lets you:
✍️ Draw, type or upload a visible signature
🔐 Create a verifiable PAdES signature with a .p12 or .pfx certificate
🇪🇸 Sign with AutoFirma and certificates such as FNMT or the Spanish electronic ID
🛡️ Protect existing signatures and detect expired certificates
Everything is processed locally in your browser. Your PDF, certificate and password are never uploaded. There is no account, no subscription and no artificial usage limit. The source code is also public.
I also wanted the product to be honest about an important distinction: placing an image of a signature on a PDF is not the same as cryptographically signing it with a digital certificate. Firma Total supports both, but explains clearly what each option provides.
This is part of Chapa Lab, my collection of small, practical web tools designed to solve everyday problems without registrations or unnecessary data collection.
I’d really appreciate your feedback, especially on the signing workflow, certificate compatibility and anything that could be explained more clearly. Thanks for trying it!
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About Firma Total on Product Hunt
“Sign PDFs locally with visible signatures or PAdES”
Firma Total was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #159 on the daily leaderboard. Firma Total is a free, privacy-first PDF signing tool that works locally in your browser. Add visible signatures, create verifiable PAdES signatures withp12/.pfx certificates, or use AutoFirma—without uploads, accounts, subscriptions or usage limits.
Firma Total was featured in Productivity (658.2k followers), Open Source (68.7k followers), GitHub (41.4k followers) and Home office (978 followers) on Product Hunt. Together, these topics include over 193.8k products, making this a competitive space to launch in.
Who hunted Firma Total?
Firma Total was hunted by Chapa Lab. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Firma Total stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Chapa Lab