🔒 Password protect PDF

Password (min 4 chars) Owner password (optional, for extra permission control) Allow printing Allow copying text Allow modification

🔓 Unlock encrypted PDF

Upload an encrypted PDF and provide its password to remove protection.

Encrypted PDF file Password

💧 Add watermark to every page

Watermark text Opacity (0.05 - 1.0) Font size Rotation (degrees) Color Position

📑 Header, Footer & Page Numbers

Use {page}, {total}, {date} as placeholders.

Header — Left / Center / Right Footer — Left / Center / Right Font size

🔢 Bates numbering (legal)

Adds sequential numbering to every page — standard for legal discovery, evidence docs.

Prefix (optional) Starting number Number of digits (zero-padded) Position

🔍 Compare two PDFs

Compare mode File A (original) File B (modified)

🔀 3-way merge

Compare two versions against a base. Green = A's additions. Blue = B's. Both = agreement.

Base PDF Version A Version B

✍ Digital signature (self-signed)

Applies a cryptographically-signed certificate using RSA-2048 + SHA-256. Self-signed — PDF viewers will show "signed but unknown issuer." For CA-trusted signatures, buy a certificate from DigiCert/GlobalSign.

Signer name Reason (optional) Location (optional)

📧 Send for signature

Generates a one-time signing link. Share it with your signer via email, chat, or SMS. They open, review, type their name, sign.

Signer email (informational only — no email sent) Signer name

✍ Create signature field

Adds an interactive signature field on the current page. Signers can sign later via PDF viewers.

Field name (internal) Position — X Position — Y Width Height

📅 Create date field

Text field with JavaScript validation — rejects input that isn't YYYY-MM-DD.

Field name Position — X Position — Y Width Height

🏷 Insert barcode

Barcode data (the value to encode) Format Position — X Position — Y Width Height

📚 Save as PDF/A (archival)

PDF/A is the ISO standard for long-term archival. Government & legal organizations often require it.

Variant

🖼 Alt text for images (accessibility)

Screen readers announce alt text to describe images. Required for WCAG compliance.

Page

Click "Load images" to scan the current page.

♿ WCAG Accessibility Audit

Note: This is an automated audit. Full WCAG 2.1 AA compliance requires a human review + certified tooling.

📥 Import form data (FDF)

Upload an FDF file exported from Acrobat or our /api/export_fdf endpoint. Values will fill matching fields in the current PDF.

FDF file

📝 Smart reflow text edit

Click on a paragraph in the PDF first, then open this dialog. The replacement text will wrap to multiple lines within the same horizontal bounds. Auto-shrinks font if it still overflows.

Paragraph bounds — X0 Y0 X1 Y1 Font size Bold New text

📋 Session audit log

Operations performed on this session.

            Loading…
        

🏷 Apply preset stamp

Applies a professional stamp like DRAFT, CONFIDENTIAL, or APPROVED to every page.

Template Position

🧹 Auto-redact sensitive data

Scans every page and permanently removes matching content (not just visual cover).

US Social Security Numbers (123-45-6789) Credit card numbers Email addresses US phone numbers International phone numbers IPv4 addresses US date format MM/DD/YYYY Fill color

✂ Crop page(s)

Enter crop box in PDF units (1 pt = 1/72 inch). Current page size shown for reference.

Apply to X start Y start X end Y end

🗂 Batch process PDFs

Upload multiple PDFs and apply the same operation to all. Processed sequentially client-side.

Choose PDFs (multiple allowed) Operation

📜 API documentation

30 REST endpoints. All accept JSON body (except uploads which use multipart/form-data). Base URL: https://gotoolsonline.com.

📤 Upload & sessionPOST /api/upload_pdf — multipart file; returns session_id
POST /api/upload_encrypted_pdf — file + password; decrypts + returns session
GET  /api/get_pdf?session_id=… — download current session PDF
GET  /api/pdf_info?session_id=… — {page_count, is_scanned, needs_pass, original_filename}
GET  /api/save_file?session_id=… — download edited PDF with _edited suffix
✏️ ContentGET  /api/get_text_blocks?session_id=… — per-line blocks across all pages
POST /api/apply_edits — body: text_edits, whiteouts, signatures, images, annotations, forms, links, freehand, add_blank_pages
GET  /api/search_pdf?session_id=…&q=… — returns matches + bbox coords
📑 PagesPOST /api/delete_pages — {pages: [0,2]}
POST /api/reorder_pages — {order: [2,0,1]}
POST /api/rotate_page — {pages, degrees: 90|180|270|-90}
POST /api/duplicate_page — {page}
POST /api/insert_blank_page_at — {position, width?, height?}
POST /api/crop_page — {pages, rect:{x0,y0,x1,y1}}
🔒 SecurityPOST /api/protect_pdf — {password, owner_password?, allow_print, allow_copy, allow_modify}
POST /api/unlock_pdf — {password}
🧹 RedactionPOST /api/redact — manual rectangles
POST /api/redact_patterns — {patterns: [ssn, credit_card, email, phone_us, phone_intl, ipv4, date_us]}
📋 FormsGET  /api/get_form_fields?session_id=…
POST /api/fill_form_fields — {values: [{name, value}]}
🔍 OCRGET  /api/ocr_languages — 21+ installed languages
POST /api/run_ocr — {lang, dpi}
🏷 StampingPOST /api/watermark — {text, image_data?, opacity, fontsize, rotation, color, position}
GET  /api/stamp_templates — list available presets
POST /api/apply_stamp_template — {template, position}
POST /api/header_footer — {header_left/center/right, footer_left/center/right, fontsize}
POST /api/bates_number — {prefix, start, digits, position}
📚 ExportPOST /api/save_as_pdfa — {variant: 1|2|3} Ghostscript PDF/A
POST /api/linearize_pdf — fast web view optimization
POST /api/compare_pdfs — multipart file_a+file_b; word-level diff
Rate limits: 20 uploads/min per IP. Max file size: 1 GB. Session TTL: 1 hour.

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