PDF & email attachment size limits (2026)
Upload limits for Gmail, Outlook, messaging apps, job portals, and government sites — with links to official documentation.
Last reviewed: June 2026 · Ethan Brooks
Email providers
| Service | Max attachment | Notes | Source |
|---|---|---|---|
| Gmail | 25 MB | Per message; total message size includes encoding overhead (~33 MB raw file theoretical max before encoding) | Google Help |
| Outlook / Microsoft 365 | 20–34 MB | Default 20 MB; admins can raise to 34 MB (150 MB with OneDrive large attachment) | Microsoft Docs |
| Yahoo Mail | 25 MB | Per email attachment | Yahoo Help |
| Proton Mail (Free) | 25 MB (paid) / 1 MB free tier | Varies by plan | Proton Support |
Messaging & collaboration
| Platform | Max file | Notes |
|---|---|---|
| 100 MB (documents) | Images/video limits differ; PDF sent as document | |
| Slack (Free/Pro) | 1 GB (paid) / 5 MB free | Plan-dependent |
| LinkedIn messaging | 20 MB (approx.) | Attachment limits not always published; compress for reliability |
| Microsoft Teams | 250 GB (SharePoint) / chat ~250 MB | Large files use SharePoint link |
Job portals & applications
| Portal | Typical PDF cap | Notes |
|---|---|---|
| Many ATS / career pages | 2–5 MB | Resume PDFs; compress aggressively |
| Indeed (employer upload) | Varies by employer | Often 2–10 MB for applications |
| Government job portals (India) | 1–10 MB | UPSC, SSC, state portals often specify per notification |
Government & tax portals (India focus)
| Portal | Typical limit | Notes |
|---|---|---|
| GST Portal (supporting docs) | 5 MB (common) | Per document type; verify current GSTN circular |
| Income Tax e-filing | 2–5 MB | Form attachments vary by ITR type |
Always verify limits on the live portal — caps change with policy updates.
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Limits sourced from official vendor documentation and portal help pages as of June 2026. Where vendors publish ranges, we show the conservative figure for PDF uploads. Report corrections via contact.