Firmar PDF Online Online Gratis
Drop files here or browse files
Supports PDF, Word, Excel, PPT & Images up to 250 MB each.
Firmar PDF Online directamente en tu navegador con WebAssembly. 100% privado, sin subir archivos a la nube y sin marcas de agua.
25M+
Docs Processed
TLS 1.3
Client Encrypted
0 Logs
Processed in RAM
EditPDFKit te permite procesar y firmar pdf online 100% localmente en tu navegador web mediante WebAssembly. Tus documentos confidenciales nunca se suben a la nube ni se almacenan en servidores externos.
6 Sign PDF Studio Superpowers (Unlimited Free Signatures)
Legally binding digital contracts signed in seconds directly in your web browser.
DocuSign charges $120/yr and iLovePDF restricts signatures behind accounts. EditPDFKit provides unlimited client-side signing for free.
1. Three Signature Modes (Draw, Type, Upload)
Draw your signature on touchscreens, type realistic cursive calligraphy, or upload a photo of your pen signature.
2. Auto Paper Background Removal
When uploading photos of your signature, our engine isolates your dark pen strokes and removes white paper backgrounds.
3. ESIGN & eIDAS Compliance
Meets international electronic signature guidelines for commercial contracts, leases, NDAs, and invoices.
4. Permanent Vector Flattening
Burn signatures directly into the PDF vector layer upon export so signatures cannot be separated or lifted.
5. Mobile Touch-Optimized
Sign contracts on iPhone, iPad, or Android using fingertip or stylus with silky-smooth 60fps canvas drawing.
6. 100% Private Client-Side Signing
Your confidential legal agreements and signature images are processed strictly in local browser memory.
How to Add Digital Signature and Sign PDF Documents Online
Simple 4-step walkthrough for fast, secure processing
Seleccionar Archivo
Arrastra y suelta tu archivo en el área de carga o haz clic para seleccionarlo desde tu dispositivo.
Configurar Opciones
Ajusta los parámetros necesarios para firmar pdf online según tus preferencias.
Procesar en el Navegador
Haz clic en el botón de acción. Tu navegador procesará el documento al instante en memoria local.
Descargar Documento
Guarda tu archivo final directamente en tu almacenamiento sin marcas de agua ni restricciones.
EditPDFKit vs. Expensive e-Sign Platforms (DocuSign & Adobe Sign)
Why thousands of privacy-conscious users choose EditPDFKit over cloud converters
| Feature | EditPDFKit (editpdfkit.com) | Commercial e-Sign (DocuSign, Adobe Sign) |
|---|---|---|
| Where Files Are Processed | Directly on Your Device (Zero Uploads) | Uploaded to Remote Company Servers |
| Privacy & Safety | Zero Uploads • Files Never Leave Your Device | Files Uploaded and Retained on Remote Company Servers |
| Signature Asset Custody & Biometric Privacy | Drawn and uploaded signatures stored exclusively in your local browser sandbox | Signature bitmaps and vector points permanently stored on remote cloud databases |
| Three Flexible Signing Methods | Draw with mouse/stylus, type in realistic cursive fonts, or upload photo with auto-transparency | Rigid signature creation; locks photo signature uploads behind monthly subscriptions |
| Unlimited Free Signing (No Monthly Quotas) | Sign unlimited contracts, NDAs, leases, and tax forms with zero recurring fees | Caps non-paying users at 3 documents per month (DocuSign, HelloSign) |
| Permanent Vector Page Flattening | Bakes signatures permanently into PDF content streams to prevent unauthorized extraction or tampering | Leaves floating image layers that can be copied, deleted, or altered by anyone |
| Built-in Privacy Vault | Saved Privately on Your Device (View or delete anytime) | Saved on Cloud Servers (Cannot verify if or when deleted) |
| Daily Usage Limits | 100% Unlimited & Free Forever | Paywalled (Only 2–3 files per day free) |
| File Size Limits | No Limits (Process files of any size) | Strict Limit (15 MB – 50 MB unless you pay) |
| Works Without Internet | Yes • 100% Offline (Works without Wi-Fi) | No • Fails without constant internet connection |
| Account & Sign In | No Signup • No Login • Zero Email Required | Forces you to create an account or give email |
| Watermarks on Your Files | 100% Clean • No Watermarks Ever | Stamps watermarks or charges to remove them |
How Sign PDF Works: Keep Your Files Safe & Private
See step-by-step how your files are processed. Everything happens right inside your browser — your files are never uploaded to the internet or shared with anyone.
1. Open on Your Device
When you pick a file, your browser opens it directly on your computer or phone. Your document stays on your device and is never uploaded anywhere.
2. Process in Your Browser
Your device does all the work right inside your browser. Because there are no server queues or waiting lines, your files are processed instantly.
3. Save in Private Vault
When you save your work, your file is stored securely inside your browser's private vault on your device. You can view or reopen it anytime, even without internet.
4. Download, Reuse, or Delete
Download your finished file, send it directly to another tool without re-uploading, or click 'Clear Vault' to permanently erase your files anytime with one click.
How You Can Prove Your Files Never Leave Your Device
Open this tool, turn off your Wi-Fi or turn on Airplane Mode, and drop your file. It will still edit, convert, or compress and let you download the result! This proves the tool works completely offline without sending anything to any server.
Press F12 on your keyboard (or right-click anywhere and choose "Inspect"), click on the Network tab, and process your file. You will see 0 bytes of your file sent over the web — absolute proof of 100% privacy.
Digital Signature Standards, Canvas Smoothing & Export Specs
Key features, device compatibility, and supported file types
Runs Directly on Your Device
Processed by your browser with zero waiting or upload lag
100% Private (0 Files Uploaded)
Safe for bank statements, IDs, tax forms, and confidential files
100% Watermark-Free
Clean original documents ready for official submissions
Drag & drop or paste directly from clipboard (Ctrl+V)
100% Free With No Limits
No account needed, no daily limits, no paywalls
Works on All Phones & Computers
iPhone, Android, Windows PC, Mac, iPad, and Chromebook
Need to Hit an Exact File Size Upload Limit?
Online job boards, immigration visa portals, universities, and court e-filing systems enforce strict KB ceilings. Select a calibrated target size solver below to compress without losing readability.
Legal & Court Portals
Strict compliance while keeping vector text razor sharp.
Job Portals & Submissions
Targeted ceiling for international and corporate submissions.
Job Portals & HR Forms
Ideal for resume attachments, certificates, and multi-page scans.
Email & Universities
Reduces large PDF decks under standard mail attachment limits.
Any Custom Limit
Set an exact target size with interactive compression preview.
Looking for a Free Alternative to Popular Cloud Tools?
Unlike cloud-based services that upload your files to remote servers or enforce hourly limits, EditPDFKit runs 100% in your browser.
Was Sign PDF helpful?
Tap a star to rate your experience. No account or email needed.
Frequently Asked Questions About Signing Documents Online
Everything you need to know about Sign PDF on editpdfkit.com