PDF Guides

Complete guide: Compress PDF for email

Gmail 25MB, Outlook 20MB, and Outlook.com 25MB explained with a fit‑or‑split workflow.

• Email preset targets
• Why 24 MB can still fail
• Automatic split if needed

Complete guide: Reduce scanned PDF size

Keep scanned pages readable while shrinking images and removing bloat.

• Image‑heavy tips
• Readability‑first approach
• Smart quality recommendations

Complete guide: Split PDF by size

Create PDF parts under a strict MB limit with stable naming and order.

• Size planning
• ZIP delivery
• Email‑ready parts

Complete guide: Rotate PDF pages online

Fix sideways pages, rotate in bulk, and keep page order intact.

• Rotate 90/180/270
• Bulk page ranges
• No text edits

Gmail attachment limit

Understand the 25MB limit and how to keep attachments deliverable.

• Limit overview
• Base64 overhead
• Safer targets

Outlook attachment limit

Why Outlook often caps at 20MB and how to avoid bounce errors.

• 20MB default
• Encoding overhead
• Split fallback

Split PDF for email

Make multi‑part PDFs for email attachments while keeping order.

• Attachment‑ready ZIP
• Ordered parts
• Custom size

How to Compress a PDF for Email

Step-by-step guide to compress PDFs for email limits with Gmail 25MB and Outlook 20MB presets. Optimize first, then split if needed.

How to Send a Large PDF by Email

Learn how to send large PDFs by email with compression and split-by-size. Keep attachments under Gmail and Outlook limits.

PDF Attachment Too Large? Here's What to Do

If your PDF attachment is too large, compress or split it in minutes. Follow this guide to send it successfully.

Make a PDF Under 20MB (Outlook)

Need a PDF under 20MB for Outlook? Follow this guide to compress or split while keeping quality.

What is a PDF?

Understand the PDF format, the difference between text and scanned pages, and when compression, splitting or organizing can help.

A short history of PDF

Follow PDF from John Warnock’s Camelot idea and the 1993 Acrobat launch to ISO standards and PDF 2.0, with practical lessons for sharing documents.

Why can’t I select text in a PDF?

Identify image-only scans, outlined letters, character mappings and copying restrictions before choosing a fix.

PDF versus PDF/A: what is the difference?

Learn what PDF/A conformance means, which archive requirements to ask about and why OCR, validation and backups remain separate.

Why won’t my PDF get much smaller?

Understand limited compression gains, already compressed images and quality tradeoffs before trying stronger settings or splitting.

Compress PDFs in Telegram: the PDFThin bot beta

How the public beta works: one PDF per minute, files up to 20 MB, the shared queue, results, errors and privacy.