Image to Base64 Converter Online - Data URI Generator
Convert images to Base64 or Data URI instantly for HTML, CSS, and API payloads.
Images are processed locally in your browser whenever possible. If local processing isn't supported or fails, we automatically complete the job on our servers - no action required. Supports JPG, PNG, WebP, AVIF, GIF, SVG, BMP, and ICO. Batch conversion with ZIP/JSON export - no signup, no watermarks.
Why Use FastImageTools
Local-First Processing
Encodes in your browser whenever possible, with automatic server fallback when required.
Instant Developer Output
Copy-ready Base64, Data URI, HTML, CSS, and JSON snippets in one workflow.
Completely Free
No signup, no watermarks, and no forced paywall for batch conversion.
Developer-Ready Export
Export as TXT, JSON, or ZIP and integrate directly into frontend or backend code.
How to Convert Image to Base64
- 1
Upload JPG, PNG, WebP, AVIF, GIF, SVG, BMP, or ICO Images
Upload one file or a batch. Drag-and-drop and paste are supported for a faster workflow.
- 2
Choose Output Type and Encoding Options
Choose Data URI or Base64-only output, optional line breaks, and re-encoding settings to match your use case.
- 3
Download or Copy Encoded Output
Copy as plain text, HTML, CSS, or JSON, or download encoded files as TXT, JSON, or ZIP.
Browser-Based vs Cloud Base64 Conversion
FastImageTools (Local-First)
- Files stay local by default
- No upload wait for supported local jobs
- Batch conversion with practical device-based limits
- Free conversion with export options included
- Can run locally; server fallback needs internet
Traditional Cloud Tools
- —Files are uploaded to remote servers
- —Upload/download overhead affects total time
- —Often restricted by free-tier quotas
- —Advanced exports commonly locked behind paid plans
- —Requires stable internet connection
Example Result
Original
1.2 MB
product-card.png
Encoded
740 KB
Visually identical
Supported Input Formats
JPEG / JPG
Common photo format. Good for compact payloads after optional re-encode.
PNG
Lossless format for screenshots and graphics with transparency.
WebP
Modern web format that often reduces payload size before Base64 encoding.
AVIF
High-efficiency format for smaller files on modern platforms.
GIF
Supports basic animation and simple graphics.
SVG
Vector graphics format for logos, icons, and UI assets.
BMP
Uncompressed bitmap format for legacy and specialized use cases.
ICO
Icon format for favicons and Windows application icons.
Frequently Asked Questions
Will converting to Base64 reduce image quality?+−
Is it safe to convert images to Base64 here?+−
What is the maximum file size supported?+−
Can I convert multiple images to Base64 at once?+−
Should I use lossy or lossless format before Base64 encoding?+−
Which format is best for web Base64 usage?+−
How is browser-based encoding different from cloud tools?+−
Are my images uploaded to your servers?+−
Related Image Tools
Use these tools before or after Base64 conversion:
Compress Image
Reduce file size before Base64 encoding.
Resize Image
Create smaller dimensions for lighter encoded payloads.
Convert to WebP
Prepare modern format assets before encoding.
Convert to AVIF
Generate high-efficiency files for compact payloads.
Metadata Editor
Inspect or strip EXIF/GPS metadata before encoding.
Optimize for Web
Run all-in-one optimization before converting to Base64.