Can I copy both raw Base64 and data URI?

Yes. The tool outputs both versions so you can use whichever format your integration expects.

What line-wrap options are supported?

You can keep output unwrapped or wrap it at common widths like 64 or 76 characters.

Does this upload my PDF?

No. File reading and encoding happen entirely inside your browser.

What formats does this tool output?

It outputs both raw Base64 text and a full data URI string, so you can choose whichever format your API or frontend expects.

Why does Base64 look larger than the original PDF?

Base64 encoding expands binary size by roughly one-third because every 3 bytes become 4 encoded characters.

Is PDF content uploaded to a server?

No. The file is read and encoded locally in your browser, so document data stays on your device.

PDF to Base64

Convert a PDF file to Base64 or data URI format for APIs, webhooks, and embedding workflows.

Updated June 2026

Files never leave your browser

Line wrap

Drop a PDF here, or click to browse

Only PDF files are supported.

Max file size: 25.00 MB

How to use PDF to Base64

PDF to Base64 converts uploaded PDF files into copy-ready Base64 strings and data URIs for API, webhook, and browser embedding workflows. It is useful when systems require documents in text-safe form, such as JSON payloads, queue messages, or signed request bodies. The tool provides optional line wrapping, size transparency, and instant copy actions so teams can move between file-based and encoded-document workflows without writing ad-hoc conversion scripts.

Upload a PDF file from your device.
Choose whether output should be unwrapped or wrapped at a fixed line length.
Copy the raw Base64 string or the full data URI representation.
Use the output in your target integration, test harness, or workflow.

Your data never leaves your device — 100% private processing.

When to use raw Base64 vs data URI

Raw Base64 is ideal for backend payload fields where MIME type is already known by contract, such as `documentBase64` properties in JSON schemas. Data URIs are better for browser and UI contexts because they embed MIME metadata alongside bytes, enabling immediate rendering or download in client apps. Teams often store raw Base64 in APIs and convert to data URI only at UI boundaries. Supporting both representations reduces transformation errors in multi-system pipelines.

Managing payload size and transport limits

Because Base64 increases size by around 33%, large PDFs can exceed API gateway, webhook, or message-broker limits even when original files look acceptable. Always compare original byte size to encoded payload size before transport. If limits are tight, prefer direct object storage uploads with signed URLs and send only metadata references. For unavoidable encoded transfer, splitting documents or compressing PDFs first can prevent request failures and retry storms.

Glossary

Line wrap: Inserting newlines at fixed intervals in Base64 output for compatibility with older parsers and transport channels.
Payload overhead: Additional size introduced by encoding or metadata compared with the original binary file.
MIME type: A standardized identifier like `application/pdf` describing file content type in protocols and data URIs.
Transport limit: Maximum request or message size permitted by an API gateway, broker, or webhook endpoint.

Frequently Asked Questions

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Why use PDF to Base64?

Generates raw Base64 and data URI outputs from the same PDF input
Supports line-wrap variants for legacy systems and email-safe transport
Shows size metrics so you can assess payload overhead before sending
Keeps conversion client-side for privacy-sensitive document handling

Common use cases

Prepare PDF payloads for JSON-based API submission
Generate data URIs for browser-driven document embedding
Create reproducible test fixtures for webhook and queue consumers
Convert signed PDFs into encoded text for low-code automation tools

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