Flint PDF

Electronic signatures, done right

Sign PDFs online — and get them signed by others

Drop in a PDF, draw or type your signature, place it on the page, done. Need a counter-signature? Add a recipient and we'll email them a unique signing link with a full audit trail.

  • Draw, type, or upload your signature
  • Drag the signature exactly where it belongs
  • Request signatures from one person or many
  • Audit log embedded in the signed PDF
↑
Drop your PDF, or click to choose
Files stay private to you. You can come back to them any time.

Drop a PDF to get started — anonymous signing works too, no email required.

Three ways to use it

Sign, request, and track in one place

Whether you're signing a contract you've been sent, getting a few people to counter-sign your own document, or gathering signatures from a list — Flint handles all three without making you pick a different tool.

Sign it yourself

Got a contract that needs your signature? Drop the PDF, draw or type your name, place it on the page, download the signed file.

Request from one person

Drag a signature box, type their email, send. They click the link, sign in their browser, you get the signed PDF + audit log.

Multi-party signing

Two co-founders, a board, a lease with five names — add every recipient at once and we email each their unique link.

Electronic signatures, demystified

What counts as a signature in 2026?

An electronic signature is any mark — drawn, typed, or uploaded — that indicates a signer's intent to agree to a document. Under the US ESIGN Act, UETA, and the EU eIDAS regulation, an electronic signature carries the same legal weight as wet ink for the vast majority of agreements: contracts, NDAs, employment agreements, leases, statements of work, and far more.

What makes one defensible isn't the visual mark — it's the audit trail. Who signed, what they signed, when, and from where. Flint stamps that information directly into the final PDF — recipient email, signing timestamp, and a per-recipient token — so the signed document carries its own evidence.

Wills, certain real-estate filings, and a handful of court documents still require ink in most jurisdictions. Everything else? Browser-based signing is the modern default.

ESIGN Act (US)UETA (US state)eIDAS (EU)UK ECA 2000

Sign your own PDF

Your signature, on any page, in seconds

Drop your PDF, create a signature once, then place it exactly where it needs to go. Flint remembers it across documents, so the next contract is one click away from signed.

  1. 1

    Drop in your PDF

    Drag a file in or pick one from your library. We open it instantly in the editor.

  2. 2

    Create your signature

    Draw it with mouse or finger, type your name in a handwriting font, or upload a transparent PNG.

  3. 3

    Place it on the page

    Drag and resize the signature box onto the right line. Add a date or initials alongside if you need them.

  4. 4

    Download the signed PDF

    Apply burns the signature into the bytes — the result is a normal PDF that opens anywhere.

Request signatures from others

Send a PDF for signature — and track it

Add one or many recipients, drag a signature box for each onto the page, and send. Each recipient gets a tokenised email link — they sign in their browser, no account required, and you get the signed PDF back the moment they're done.

Multi-party signing? Add everyone at once and we'll notify you as each one signs. When the last signature lands, the final composite PDF is yours — with every signer's email and timestamp stamped beside their signature.

Open eSign

Tokenised signing links

Each recipient gets a unique URL that only opens their slot. No login required on their end.

Drag-and-drop placement

Drop a signature box onto the page once per signer — Flint handles the rest.

Real-time progress

Watch your request dashboard as each recipient opens, signs, and finalises.

Audit trail in the file

Each signer's email and timestamp get stamped into the final composite PDF.

Where it earns its keep

Built for the documents you actually sign

Contracts & SOWs

Counter-sign a vendor contract, send an SOW for client sign-off, or close a one-pager NDA — all in your browser.

Co-founder agreements

Get every founder's signature on the same document with one round of tokenised links.

Offer letters

Send a candidate their offer, they sign on their phone, you get the signed PDF in your library.

Leases & rentals

Two parties, multiple pages, dates and initials — drop signature boxes on every spot at once.

Permission slips & waivers

Schools, gyms, events — send a templated PDF to every parent or attendee in one batch.

Compliance acknowledgements

Make sure every employee has signed the policy, with a per-person audit trail.

FAQ

Frequently asked questions

Are electronic signatures legally binding?
In most jurisdictions, yes. In the United States the ESIGN Act and UETA give electronic signatures the same legal standing as wet-ink signatures for the vast majority of business and personal documents. The EU's eIDAS regulation does the same across member states. A handful of document types (wills, certain real-estate filings, some court documents) still require ink — check your local rules for those.
What's the difference between a signature and a digital signature?
An electronic signature is any digital mark indicating intent to sign — typing your name, drawing it on a touchscreen, or uploading a signature image. A digital signature is a specific cryptographic technique that binds a signature to the document mathematically using PKI. Flint produces electronic signatures with an audit trail (timestamp, email, IP) that holds up the same way most signing platforms do.
How does Flint verify the signer?
For request-a-signature flows, recipients click a unique tokenised link in their email. The signature is bound to that token, the recipient's email, the document, and an event timestamp. Each signed document carries an audit log showing who signed, when, and from which email — visible to the sender and stamped into the final PDF.
Can I sign on my phone?
Yes. Use a finger or stylus to draw your signature, or type your name and pick a handwriting font. Recipients can sign on their phone too — the request page is mobile-first.
Can multiple people sign the same document?
Yes. Add as many recipients as you need, drag a signature box for each onto the page, and we email everyone their unique signing link. The document is finalised once everyone has signed.
Are my files private?
Files are processed only for the action you trigger and stay tied to your account. Recipient signing pages are tokenised — only people with the link can access the document, and the link is single-purpose.
Is it free?
You can try signing in the browser without an account. Downloading the signed PDF and sending signature requests require a Flint Pro plan.
What's the maximum file size?
Flint Pro accepts PDFs up to 250 MB.
Do I need to install anything?
No. The entire flow — signing your own document, requesting signatures from others, audit-trail viewing — runs in your browser.

Get your PDF signed.

Try it free in the browser — no account required to get started, Pro to download or send for signature.

↑
Drop your PDF, or click to choose
Files stay private to you. You can come back to them any time.

More from Flint PDF

More PDF tools

Built browser-side, share the same editor.

Edit

Change what's on the page.

Organize

Rearrange or combine pages and files.

Export

Optimize or convert for sharing.

Sign PDF Online — Electronic Signatures + Request Signatures — Flint PDF