Format guide
What is PDF?
Portable Document Format is a Portable Document Format file that preserves fixed layout across devices, created by Adobe (1993). PDF makes contracts, reports, and print-ready docs look the same everywhere. Prefer DOCX/ODT while collaborating, then convert to PDF for signatures, distribution, and archiving.
PDF format specifications
- Full name
- Portable Document Format
- Kind
- fixed-layout document
- File extension
- MIME type
- application/pdf
- Developer / standard
- Adobe · 1993
- Compression
- mixed
- Quality model
- Lossy and lossless modes
- Container
- Yes — may carry multiple codecs
- Common codecs
- Flate, JPEG, JPEG2000
- Technical sources
- ISO: PDF (ISO 32000)
- Transparency
- Supported
- Animation
- No (still / non-animated typical use)
- Typical size
- Varies widely with images and fonts
- Browser support
- Built-in PDF viewers in modern browsers
- Compatibility
- Universal on desktops, phones, and browsers with built-in readers — the default fixed-layout exchange format for business
PDF compression & quality
PDF can embed compressed images, fonts, and streams. Scanned PDFs are only as light as their page images; text-based PDFs stay compact. “Quality” is about embedded assets and whether text is real or rasterized.
Quality: Fixed layout fidelity across devices
Typical size: Varies widely with images and fonts
Transparency & animation
PDF supports transparency (including alpha where the codec/container allows). Keep a format with alpha when you need soft edges or overlays.
PDF is a still-media or non-animated format in typical use. Use GIF, APNG, video, or animated WebP when you need motion.
PDF metadata
Info dictionary + XMP (title, author, subject, keywords, dates, producer). Remove metadata before sharing confidential drafts if required by policy.
Related tools: PDF metadata viewer · PDF metadata remover
Best use cases for PDF
- Final reports and proposals
- Print-ready documents
- Forms and contracts
- Read-only handouts from slides
When to avoid PDF
- Heavy collaborative drafting
- Reflowable ebook reading (prefer EPUB)
- Extracting tabular data without tools
- Logo source files (prefer SVG)
Advantages
- Consistent layout everywhere
- Embeds fonts and images
- Universal readers
- Strong for archival distribution
- Ideal final form after DOCX editing
Disadvantages
- Awkward to edit
- Accessibility varies by producer
- Can hide sensitive metadata
- Large scanned PDFs without OCR are not searchable
Compatibility
Universal on desktops, phones, and browsers with built-in readers — the default fixed-layout exchange format for business
Browsers: Built-in PDF viewers in modern browsers
Software support
- Adobe Acrobat
- Preview
- Chrome
- LibreOffice
Device support
- All major platforms
- Modern desktops
- Phones and tablets with compatible apps
How to open PDF
Open in Chrome/Edge/Safari, Preview, Acrobat, or any PDF app. For forms, use a reader that supports filling and signing.
How to convert PDF
Convert PDF to Word or images, or build PDFs from documents, using Format Convertly’s browser workflow so contracts and reports never upload to a third party.
Popular PDF conversions
Convert to PDF
Incoming conversions strengthen the PDF cluster — e.g. JPG → PDF, PNG → PDF.
PDF comparison guides
Compare PDF with related formats to pick the right container for quality, size, and compatibility.
Best format guides featuring PDF
Decision pages that cite PDF — the next hop after a vs comparison.
PDF how-to guides
Related formats
PDF tools
Tools extend the format graph beyond one-off conversion — compression, metadata, and utilities for real workflows.
Technical sources
PDF FAQ
What is a PDF file?
PDF is a Portable Document Format file that preserves fixed layout across devices. PDF makes contracts, reports, and print-ready docs look the same everywhere. Prefer DOCX/ODT while collaborating, then convert to PDF for signatures, distribution, and archiving.
Is PDF lossy or lossless?
PDF is typically lossless or non-destructive in common use (mixed).
Does PDF support transparency?
PDF supports transparency (including alpha where the codec/container allows). Keep a format with alpha when you need soft edges or overlays.
How do I open a PDF file?
Open in Chrome/Edge/Safari, Preview, Acrobat, or any PDF app. For forms, use a reader that supports filling and signing.
How do I convert PDF privately?
Convert PDF to Word or images, or build PDFs from documents, using Format Convertly’s browser workflow so contracts and reports never upload to a third party. Format Convertly keeps processing in your browser so files are not uploaded to a conversion server.
Is PDF editable like Word?
PDF prioritizes fixed layout. For heavy edits, convert to DOCX when the PDF has a real text layer — scanned pages may need OCR first.
Does PDF store metadata?
Yes — title, author, producer, dates, and sometimes more. Use a metadata viewer/remover before publishing sensitive docs.
Are my PDF files uploaded on Format Convertly?
No. PDF conversion runs in your browser. Files are not sent to Format Convertly servers for processing.