The PDF library
TypeScript deserves
Parse, modify, sign, and generate PDFs with a modern TypeScript API.
The only library with incremental saves that preserve digital signatures.
npm install @libpdf/corebun add @libpdf/core
Capabilities
Everything you need for PDFs
Incremental Updates
Append changes without rewriting the entire file. Preserves existing digital signatures.
Digital Signatures
PAdES B-B through B-LTA with long-term validation. OCSP and CRL embedding.
Encryption
AES-256 and RC4 password protection. Decrypt on load, encrypt on save.
Form Filling
Fill and flatten text fields, checkboxes, radio buttons, and dropdowns.
Text Extraction
Extract text content from pages with position and formatting information.
Merge & Split
Combine multiple documents, extract page ranges, and embed pages as XObjects.
Attachments
Embed and extract file attachments with full EmbeddedFiles support.
Content Drawing
Draw text and images on pages. TrueType font embedding with automatic subsetting.
Developer Experience
An API that makes sense
No wrestling with low-level PDF internals. Load documents, manipulate them with intuitive methods, and save. The complexity is handled for you.
- Familiar API patterns from pdf-lib
- Robust malformed PDF parsing from pdf.js
- Incremental saves that preserve signatures
import { PDF, P12Signer } from '@libpdf/core';
// Load an encrypted PDF
const pdf = await PDF.load(bytes, { password: 'secret' });
// Fill form fields
const form = pdf.getForm();
form.getTextField('name').setText('Jane Doe');
form.getCheckBox('agree').check();
// Sign with a certificate (returns the signed bytes)
const signer = await P12Signer.create(p12Bytes, 'password');
const { bytes: signed } = await pdf.sign({ signer });Comparison
The best of both worlds
pdf.js excels at parsing. pdf-lib excels at generation. LibPDF does both, plus incremental updates and digital signatures.
| LibPDF | pdf-lib | pdf.js | |
|---|---|---|---|
| Incremental saves | |||
| Digital signatures | |||
| Encrypted PDFs | |||
| Parse existing PDFs | |||
| Modify existing PDFs | |||
| Generate new PDFs | |||
| Text extraction | |||
| Form filling | |||
| Merge documents | |||
| Render to image | |||
| TypeScript-first |
Add PDF support in minutes
Follow the quickstart guide and ship your first PDF feature today.