Twilio error 63005 means the content you attempted to send through the WhatsApp channel was rejected by WhatsApp's content validation layer because it does not conform to what is permitted for the current message type or session context. WhatsApp enforces strict rules about which content types, media formats, and file sizes are allowed in different messaging scenarios, and 63005 fires when any of these constraints are violated. The error can appear for both template messages and freeform session messages depending on which content rule is being violated.
What Causes This Error
Sending a media file that exceeds WhatsApp's size limits is a common trigger: images must be under 5MB, audio files under 16MB, video files under 16MB, and documents under 100MB, and any file exceeding these limits will be rejected with 63005. Using an unsupported media MIME type is a second cause: WhatsApp accepts JPEG and PNG for images, MP4 and 3GP for video, MP3, OGG, and AAC for audio, and PDF for documents, and sending formats outside these accepted types causes content rejection. Attempting to include interactive buttons or list messages with more options than WhatsApp permits (a maximum of 3 quick reply buttons per message, or a maximum of 10 list items per section) produces a 63005 because the interactive content structure exceeds the platform's schema limits. Sending a template message where the body text, after variable substitution, exceeds WhatsApp's character limits (1024 characters for the body component) also produces content rejection, as does using special characters or formatting in header components that WhatsApp does not support.
How to Fix It Step by Step
Retrieve the failed message detail from Twilio Console under Monitor, then Logs, then Messages, and examine the message body, any MediaUrl parameters, and the ContentSid if a content template was used to identify exactly what content was in the rejected message. If the message included media, check the file size of each attachment by accessing the media URL and examining the Content-Length response header or the file metadata, comparing each value against WhatsApp's documented limits for that media type. If you are using Twilio Content Templates, open the template in Console under Messaging, then Content Template Builder and verify the template structure: check the total character count of the body with all variables filled in, confirm button labels do not exceed 25 characters, and confirm the number of interactive options does not exceed platform limits. Reduce image file size by recompressing to JPEG at 80 percent quality using an image processing library, convert unsupported media formats to a WhatsApp-accepted format (PNG to JPEG, MOV to MP4), and restructure interactive messages to stay within button and list item count limits, then retry the send.
How to Prevent It from Recurring
Add server-side content validation before submitting any WhatsApp message that includes media: check file size against WhatsApp's limits, verify the MIME type against the accepted list for each media category, and reject oversized or unsupported files at your application's upload boundary before they enter the message queue. For interactive messages built dynamically (buttons generated from database content, lists generated from product catalogs), add a constraint check in your message construction logic that caps the number of buttons at 3 and list items at 10, truncating or paginating the content if the source data exceeds these limits. Implement a content preview and validation step for any content template that uses variable substitution by pre-filling all variables with their maximum expected values and checking the total character count before the template is submitted for approval, ensuring approved templates will never exceed limits in production. Add 63005 to your error monitoring alerts with a payload logger that captures the full message body and media parameters at the time of the error, so you can identify exactly which content type caused the rejection without needing to reproduce the failure.
When to Call a Specialist
If 63005 errors are appearing on messages that appear to comply with all documented WhatsApp content limits, the issue may be a less-documented constraint such as a restriction on specific Unicode character ranges in template bodies, a newly introduced limit that WhatsApp has deployed without updating its public documentation, or a regional content restriction applied to your WhatsApp Business Account. A specialist can cross-reference your specific content against the WhatsApp Business API changelog and known undocumented restrictions to identify the exact constraint being violated. You should also seek specialist help if you are building rich media messaging flows (product catalogs, interactive order confirmations, appointment booking buttons) and need to design content structures that maximize expressiveness while staying within all WhatsApp content constraints, as this requires deep familiarity with the Content Template Builder and WhatsApp's interactive message schema.
Conclusion
Error 63005 is a content validation failure that is resolved by checking file sizes and MIME types against WhatsApp's accepted formats and ensuring interactive message structures stay within platform limits. If this error is blocking your production system, contact our team and we will diagnose and fix it within the hour.
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