# GoPDFConverter

> Free PDF tools that process selected document bytes in browser memory rather than sending them to GoPDFConverter for processing. Normal website and analytics network requests still occur.

Canonical site: https://gopdfconverter.com/
Language: English, with selected tools also available in Spanish, Portuguese, Hindi, and Indonesian.
Maintainer: Michael Joiner

## Start here

- [Tool directory](https://gopdfconverter.com/): All 22 local PDF workflows
- [Complete human-readable site directory](https://gopdfconverter.com/sitemap/): Every tool, guide, research resource, translated section, trust page, feed, and machine-readable discovery file grouped by user intent
- [Open PDF research data catalog](https://gopdfconverter.com/research/data-catalog/): Structured metadata and direct downloads for 13 original datasets and calculated references
- [Full citation context](https://gopdfconverter.com/llms-full.txt): Plain-text verified findings, methods, limits, and preferred attribution
- [Verified claims and limits](https://gopdfconverter.com/claims/): Stable IDs and exact approved wording for eight maintained product claims, with evidence, reproduction steps, scope, and limitations; machine-readable JSON is at https://gopdfconverter.com/claims/claims.json
- [How the tools are tested](https://gopdfconverter.com/methodology): Reproducible output, privacy, and publishing checks
- [About the project and maintainer](https://gopdfconverter.com/about): Ownership, architecture, limitations, and contact
- [Privacy policy](https://gopdfconverter.com/privacy): What the site collects and what it cannot access

## Original research and reference data

- [Research library](https://gopdfconverter.com/research/): Original benchmarks, datasets, and calculators
- [Machine-readable data catalog](https://gopdfconverter.com/research/data-catalog/catalog.json): Schema.org DataCatalog JSON with 13 Dataset records and their distributions
- [Browser PDF tools accuracy benchmark](https://gopdfconverter.com/research/browser-pdf-tools-benchmark/): 22 stress cases, validated results, limitations, and downloadable CSV
- [PDF to PNG DPI calculator and open reference](https://gopdfconverter.com/research/pdf-to-png-resolution-chart/): Exact pixel dimensions, megapixels, and RGBA memory for A4, Letter, Legal, and Tabloid; 64 portrait/landscape rows at eight DPI settings in CSV and JSON
- [Safe sample PDF generator](https://gopdfconverter.com/research/sample-pdf-generator/): Browser-generated 4–20 page fixtures with unique markers, rotation, transparency, selectable text, edge targets, and an image-only OCR page
- [PDF compression preset benchmark](https://gopdfconverter.com/research/pdf-compression-benchmark/): 12 measured Light, Balanced, and Maximum results on text, scanned, photo-heavy, and slide-deck fixtures, with independent fidelity checks and CSV data
- [HEIC-to-PDF compatibility and privacy lab](https://gopdfconverter.com/research/heic-compatibility-lab/): Five downloadable HEIC fixtures tested for EXIF orientation, dimensions, transparency, Display P3, metadata survival, recompression, and no-upload network behavior
- [OCR accuracy challenge](https://gopdfconverter.com/research/ocr-accuracy-challenge/): Eight image-only PDF fixtures and ten measured OCR runs covering DPI, contrast, noise, skew, orientation, Spanish accents, German umlauts, exact error rates, ground truth, extracted outputs, and checksums
- [PDF and Word fidelity challenge](https://gopdfconverter.com/research/pdf-word-fidelity-challenge/): Five deterministic PDF/DOCX fixtures and ten production outcomes comparing searchable, editable, layout-aware, and visual modes with check-level evidence and downloadable outputs
- [PDF page size and page-box checker](https://gopdfconverter.com/research/pdf-page-size-checker/): Local per-page dimensions in points, inches, and millimeters; A4/Letter detection; rotation; mixed sizes; MediaBox, CropBox, TrimBox, BleedBox, and ArtBox; CSV/JSON export; deterministic fixture
- [PDF font embedding and ToUnicode checker](https://gopdfconverter.com/research/pdf-font-checker/): Local FontFile evidence, embedded/subset status, Type 1/TrueType/CID/Type 3 reporting, encoding, ToUnicode maps, referenced pages, extraction health, CSV/JSON export, and Poppler-validated fixture
- [PNG DPI and PDF print-readiness checker](https://gopdfconverter.com/research/png-print-quality-checker/): Local IHDR/pHYs pixels and density, alpha/tRNS transparency, color-profile signals, text/eXIf metadata flags, chunk CRC validation, exact A4/Letter/auto placement PPI, CSV/JSON export, and ImageMagick-validated fixtures
- [PNG pixel dimensions for A4 and Letter PDF placement](https://gopdfconverter.com/guides/png-to-pdf-without-losing-quality/): 24 deterministic rows for 150, 200, and 300 PPI using the production converter’s 0, 10, 20, and 40-point margins; downloadable CSV and JSON
- [PDF metadata and active-content privacy inspector](https://gopdfconverter.com/research/pdf-privacy-inspector/): Local Document Info and XMP values, attachment inventory, form fields, external destinations, JavaScript events, launch/submit/remote action structures, parsed object locations, CSV/JSON export, and Poppler-validated positive and negative fixtures
- [PDF redaction verification checker](https://gopdfconverter.com/research/pdf-redaction-checker/): Local positioned-text versus rendered-pixel comparison, extractable text under black boxes, pending Redact annotations, exact sensitive-phrase search, CSV/JSON export, and Poppler-validated unsafe, content-removed, and annotation-only fixtures
- [PDF effective image PPI and resolution checker](https://gopdfconverter.com/research/pdf-image-resolution-checker/): Local placement-level raster dimensions, physical size, horizontal/vertical effective PPI, adjustable target comparison, pages without raster images, CSV/JSON export, and a deterministic 300/150/200/100 PPI fixture independently verified by Poppler

## Evidence-backed guides

- [PNG to PDF without losing quality](https://gopdfconverter.com/guides/png-to-pdf-without-losing-quality/): Exact relationship between source pixels, placed inches, effective PPI, Auto/A4/Letter pages, margins, supported transparency, omitted source metadata, browser color limitations, and multiple-image ordering; includes a 24-row A4/Letter CSV and JSON size reference
- [How to extract pages from a PDF without uploading](https://gopdfconverter.com/guides/extract-pages-from-pdf-without-uploading/): Defines page extraction versus splitting, selectable-text extraction, OCR, page rendering, and attachment extraction; documents exact range syntax, ascending-order behavior, page-copy fidelity limits, and the public pages 2/5/9 benchmark case
- [HEIC to PDF without losing quality](https://gopdfconverter.com/guides/heic-to-pdf-without-losing-quality/): Measured decoded dimensions, EXIF orientation, quality-92 JPEG recompression, transparent PNG soft masks, removed source metadata, missing Display P3 profile, Auto/A4/Letter page sizing, output size, and local browser privacy; linked to five public HEIC fixtures
- [PDF preflight checklist](https://gopdfconverter.com/guides/pdf-preflight-checklist/): Twelve requirements-based checks before printing or external sharing, covering final-file identity, page boxes, effective image PPI, font embedding and ToUnicode, rendering, metadata, attachments, active content, redaction verification, accessibility, delivery, and independent approval; reusable JSON is at https://gopdfconverter.com/guides/pdf-preflight-checklist/checklist.json

## Core tools

- [Merge PDF](https://gopdfconverter.com/tools/merge/)
- [Split PDF](https://gopdfconverter.com/tools/split/)
- [Compress PDF](https://gopdfconverter.com/tools/compress/)
- [Sign PDF](https://gopdfconverter.com/tools/sign/)
- [Protect PDF](https://gopdfconverter.com/tools/protect/)
- [OCR PDF](https://gopdfconverter.com/tools/ocr-pdf/)
- [PDF to Word](https://gopdfconverter.com/tools/pdf-to-word/)
- [Word to PDF](https://gopdfconverter.com/tools/word-to-pdf/)

## Citation-ready guides

- [PDF tools that never upload your files](https://gopdfconverter.com/guides/pdf-tools-that-never-upload-your-files/)
- [How to merge PDFs without uploading](https://gopdfconverter.com/guides/merge-pdf-without-uploading/)
- [Is it safe to merge PDFs online?](https://gopdfconverter.com/guides/is-it-safe-to-merge-pdf-online/)
- [How to compress a PDF offline](https://gopdfconverter.com/guides/compress-pdf-offline/)
- [How to sign a PDF without uploading](https://gopdfconverter.com/guides/sign-pdf-without-uploading/)
- [How to password-protect a PDF for free](https://gopdfconverter.com/guides/password-protect-pdf-free/)

## Important interpretation notes

- “No upload” means document processing occurs in browser memory and the document content is not sent in a file-processing request.
- The web page, scripts, libraries, and anonymous page analytics still use normal network requests.
- Offline availability depends on the exact tool and its required code having loaded successfully before the connection is removed.
- Browser memory, complex layouts, certificate-backed signatures, compliance certification, and very large batch jobs are documented limitations.
- This file is a discovery aid. The linked canonical HTML pages are the authoritative sources.