Upload Size Limits, With a Tool for Each
The largest file each service accepts, and the photo and signature rules of common application forms. Every limit links to the service's own page and shows when it was last checked. Next to each one is the tool on this site that gets your file under it.
Email and chat apps
| Service | Limit | Notes | Make it fit |
|---|---|---|---|
| GmailAttachments per email | 25 MB | Bigger files are sent as a Google Drive link instead. Source | compress for gmail |
| Outlook.comAttachments per email | 25 MB | Larger files can be shared from OneDrive instead. Source | compress zip |
| WhatsAppFiles sent as a document | 2 GB | Photos and videos sent from the gallery are compressed by WhatsApp; send as a document to keep the original. Source | compress video |
| SlackEach uploaded file | 1 GB | Source | compress video |
| TelegramEach file | 2 GB (4 GB with Premium) | Source | compress video |
Application forms and exams
Forms set more than a maximum: a size range, exact pixels and a format. Each link opens the upload-rules tool with that form's rules filled in. Full guides: IBPS and OCI.
| Form | Rules | Make it fit |
|---|---|---|
| IBPS (PO, Clerk, RRB)Photograph · source | JPEG · 20–50 KB · 200 × 230 px (preferred) | Fit a photograph |
| IBPS (PO, Clerk, RRB)Signature · source | JPEG · 10–20 KB · 140 × 60 px (preferred) | Fit a signature |
| IBPS (PO, Clerk, RRB)Left thumb impression · source | JPEG · 20–50 KB · 240 × 240 px (preferred) | Fit a left thumb impression |
| IBPS (PO, Clerk, RRB)Hand-written declaration · source | JPEG · 50–100 KB · 800 × 400 px (preferred) | Fit a hand-written declaration |
| OCI cardPhotograph · source | JPEG · max 200 KB · square · 200×200 to 900×900 px | Fit a photograph |
| OCI cardSignature · source | JPEG · max 200 KB · 3:1 · 200×67 to 900×300 px | Fit a signature |
| US visa (DS-160, DS-260)Photo · source | JPEG · max 240 KB · square · 600×600 to 1200×1200 px | Fit a photo |
| US passport online renewalPhoto · source | JPEG · 54 KB–10 MB | Fit a photo |
All limits last checked on 24 September 2026. Services change them, so follow the source link before relying on one.
Frequently asked questions
What is the largest attachment Gmail and Outlook.com accept?
Both take up to 25 MB of attachments per email. Gmail sends anything larger as a Google Drive link, and Outlook.com offers OneDrive sharing instead. To attach a folder of photos or scans directly, zip it and compress the ZIP to about 24 MB with /compress-zip?target=24mb.
Why does a file just under the limit still get rejected?
Services disagree on what a KB or MB is. Some count 1 MB as 1,000,000 bytes, others as 1,048,576. A file of 1,030,000 bytes is under the second and over the first. When a form gives its limit in KB or MB without saying which, aim a few percent under it; the upload-rules tool does this for you, keeping files under the stricter reading.
How do I send a large video on WhatsApp without it being compressed?
Attach it as a document rather than from the photo gallery. Documents go through at their original quality up to 2 GB, while gallery videos are recompressed by WhatsApp. If the file is over 2 GB, compress it first with /compress-video.