Sign & Write on PDF
Sign and fill documents without uploading
About this tool
Sign PDF files and fill in their fields directly in your browser without uploading them anywhere. Draw your signature with six pen types — fountain ink, ballpoint, calligraphy nib, brush, pencil and marker — type it in one of six fonts, or upload a photo of it and have the background removed automatically. Add text in any color, size and font with highlighting, underline and alignment, draw freehand on any page, then download a signed copy that leaves the original document intact.
The problem it solves
A contract or form arrives as a PDF and needs signing today. So you print it, sign it by hand, photograph it with your phone, and send back a skewed, badly lit file that is hard to read. Or you reach for a free signing site that wants the document uploaded to its server — a contract carrying your name, your ID number and your financial terms, handed to a party whose storage and retention you know nothing about, and many of them stamp a watermark or cap how many files you can process.
How to use it
- 01
Drop a PDF
Drag the document onto the drop zone or pick it from your device. It opens inside your browser and is never uploaded.
- 02
Create your signature
Press “Signature”, then draw it with one of six pens, type your name in one of six fonts, or upload a photo and have its background removed.
- 03
Place it
Drag the signature onto the signature line, and use + and − to size it to the field.
- 04
Fill in the rest
Use the text tool to add names, dates and details in any font, colour and size, or draw freehand to mark up the document.
- 05
Download the signed copy
Press “Download signed” to produce a new file carrying your signature, leaving your original document unchanged.
What it gives you
- 01Signing and filling entirely inside your browser — the document never leaves your device
- 02Six signature pen types: fountain ink, ballpoint, calligraphy nib, brush, pencil and marker
- 03Three ways to sign: draw with finger or mouse, type in one of six fonts, or upload a photo
- 04Automatic background removal on an uploaded signature, tinted to your ink colour so it never lands as an opaque rectangle
- 05Text in six fonts and eight colours with bold, italic, underline, highlight and alignment
- 06Freehand drawing on any page, drag to reposition anything, with undo and redo
- 07A signed file that preserves the original document and its pages — drawn on top, never rebuilt
What it does not do
The tool adds a visible signature, text and drawing on top of the document’s pages, which is what most contracts, forms and administrative letters need. What it does not create is a certified digital signature backed by a cryptographic certificate (PKI) — the kind issued by an accredited authority that technically proves who signed and reveals any later tampering. If the receiving party requires a certified digital signature, as some government and banking processes do, use their approved platform. Added text is also painted into the page as an image: it prints at high resolution and looks exactly as designed, but it is not selectable or searchable in the resulting file.
Frequently asked questions
01Is my document uploaded to a server?
No. The file is read, displayed, signed and saved entirely inside your browser, and its bytes are never sent anywhere. That is why there is no size limit, and why you can safely sign a contract carrying your personal details. To verify: open the network tab in your developer tools, drop your file, sign it, and you will see no request carrying the document.
02Is a signature from this tool legally valid?
The tool produces a simple electronic signature — an image of your signature added to the document — which is accepted in many commercial and administrative dealings, in the same way a hand-signed and scanned document is. It is not a certified digital signature backed by a cryptographic certificate that proves identity and reveals tampering, which some government and banking bodies require. The practical rule: if the other party would accept a signed-and-scanned document, they will accept this, and it will look cleaner. If they ask for a certified digital signature, use their approved platform.
03What is the difference between the six pen types?
Each pen computes line width differently. Fountain ink thins as your hand speeds up and swells as it slows, which reads closest to a real signature. The ballpoint holds a constant width and is clearer for legible names and small fields. The calligraphy nib is wide across and thin along, like an Arabic calligraphy pen. The brush responds strongly to speed and pressure for loose, high-contrast strokes. The pencil is soft and grainy — for notes, not a binding signature. The marker is broad and semi-transparent for highlighting. If your device has a stylus, real pen pressure is read and genuinely affects the width.
04Why can’t I select the text I added in the resulting file?
Because the text is painted into the page as a high-resolution image rather than written as characters. The reason is technical and deliberate: writing Arabic as real text inside a PDF requires an embedded Arabic font plus a shaping engine to join and order the letters, and without one the letters come out disconnected and reversed — the same failure that affects many tools. By painting the text through the browser’s own text engine we guarantee Arabic appears joined and correctly ordered, exactly as you see it in the preview. The cost is that the text is not selectable or searchable, but it prints at full resolution and displays correctly in every PDF reader.
05Can I sign more than one page, and does the original change?
Yes — move between pages and add whatever you need on each; every item stays tied to its page. The original document is untouched: the tool opens a copy in memory, draws on top of it, and produces a new file with a “-signed” suffix, leaving the document’s pages, fonts and metadata as they were. The file on your disk never changes.