Does conversion reduce image quality?

Converting to PNG is lossless. JPEG and WebP use adjustable quality - set it to 100 for maximum quality.

Can I convert SVG to PNG?

Yes. Drop an SVG file and convert it to PNG, JPEG, or WebP at the rendered resolution.

FileWelder - Free Browser-Based Batch File Processing Tool

Q: Is there a file size limit?

No artificial limit. Conversion depends on your browser\u2019s available memory.

Process files in batch directly in your browser. Resize, convert, and compress images. Merge, split, and watermark PDFs. Convert CSV, JSON, and GPX. 65+ free tools - your files never leave your browser.

Image Tools

Resize Images - Resize images to exact dimensions
Convert Image Format - Convert between PNG, JPEG, and WebP
Grayscale - Convert images to grayscale
Crop Images - Crop images or auto-trim borders
Compress Images - Reduce file size with adjustable quality
Rotate Images - Rotate by 90, 180, or 270 degrees
Stack Images - Stack images horizontally or vertically
Image Collage - Arrange images in a grid
Images to PDF - Combine images into a PDF
Remove EXIF Data - Strip metadata from images for privacy
Add Watermark - Add text watermarks to images
Image Border - Add borders or padding around images
Pixel Art Scaler - Scale pixel art with nearest-neighbor interpolation
Favicon Generator - Generate multi-resolution .ico favicons
EXIF Viewer - View EXIF metadata of images
Color Palette - Extract color palettes from images
Animated WebP - Create animated WebP from images

PDF Tools

Merge PDFs - Combine multiple PDFs into one
Split PDF - Split into individual pages or ranges
PDF Watermark - Add text watermarks to PDFs
Rotate PDF Pages - Rotate pages by 90, 180, or 270 degrees
Add Page Numbers - Number every page of a PDF
PDF to Images - Convert PDF pages to PNG or JPEG
Extract PDF Pages - Extract specific pages from a PDF

CSV & Data Tools

Merge CSV Files - Stack CSV files vertically into one
CSV to JSON - Convert CSV to JSON arrays
JSON to CSV - Convert JSON arrays to CSV
Format JSON - Pretty-print, minify, or validate JSON
Filter CSV Columns - Select or exclude columns
Sort CSV - Sort rows by any column
CSV Statistics - Compute per-column statistics
Transpose CSV - Swap rows and columns
Join CSVs - Join CSV files by a common key column
Data Plot - Create charts from CSV columns

Text Tools

Case Converter - Convert to upper, lower, title, or sentence case
Sort Lines - Sort lines and remove duplicates
Find & Replace - Search and replace with strings or regex
Text Statistics - Count lines, words, characters, reading time
Text Diff - Compare two text files side by side

GPX / GPS Tools

18 tools for processing GPS tracks from Strava, Garmin, Komoot, AllTrails, and other GPS devices.

GPX to CSV - Export trackpoints as CSV
GPX to GeoJSON - Convert tracks to GeoJSON
GPX to KML - Convert for Google Earth
GPX to SVG - Render tracks as vector art
Merge GPX - Combine multiple GPX files
Split GPX - Split into separate track files
Clean GPX Metadata - Remove device-specific extensions
Reverse GPX Track - Flip track direction
Crop GPX Track - Trim start/end for privacy
GPX Zone Filter - Remove points in a geographic zone
Simplify GPX - Reduce trackpoint count
Denoise GPX - Remove GPS spikes and outliers
Smooth Elevation - Fix noisy altitude data
GPX Time Shift - Fix timezone issues
GPX Track Map - Plot tracks as a 2D map
Elevation Profile - Plot elevation vs distance
GPX Heatmap - Visualize activity density
GPX Statistics - Distance, elevation, speed stats

File Utilities

File List - Generate file listings with name, size, type
Deduplicate Files - Remove duplicate files by content hash
Batch Rename - Rename files with prefix, suffix, or numbering
Create ZIP - Bundle files into a ZIP archive
Extract ZIP - Unzip ZIP archives
File Hash - Generate SHA-256, SHA-1, or SHA-512 checksums
Base64 Encode/Decode - Encode files to Base64 or decode back
QR Code Generator - Generate QR codes from text

JavaScript is required to use FileWelder. Please enable JavaScript in your browser settings.

Why FileWelder?

Private by Design

Your files never leave your device. All processing happens locally in your browser - no analytics, no tracking scripts, no data collection.

Instant Processing

No waiting for uploads or downloads. Files are processed directly on your machine at native speed.

One Tool, Many Formats

Images, PDFs, CSV, JSON, text, and GPX - 65 tools for resizing, converting, merging, plotting, and more.

No Installation

Works in any modern browser. No software to download, no plugins, no sign-up. Install as a PWA for offline use.

How It Works

Drop Files

Drag and drop files or click to browse. FileWelder automatically detects file types.

Pick a Tool

Choose from tools matched to your files. Configure options to get exactly what you need.

Save Results

Save processed files individually or as a ZIP. No sign-up, no email required.

All 65 Tools

Who Uses FileWelder?

🖼

Photos & Graphics

Batch-resize, compress, and convert hundreds of images for web galleries.

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Code & Data

Format JSON, convert between CSV and JSON, and generate file listings.

🗺

Tracks & Routes

Convert GPX tracks to CSV or GeoJSON, merge multi-day routes, and strip metadata.

📄

Documents & PDFs

Merge and split PDFs, add page numbers and watermarks, de-duplicate files.

How FileWelder Compares

Unlike online converters, FileWelder never uploads your files. No account needed, no watermarks on output, no per-file limits, no tracking scripts. Everything runs in your browser - your data stays yours.

Transparency

FileWelder processes files using your browser's memory. Very large files (500 MB+) may be slow or fail on devices with limited RAM.

Frequently Asked Questions

Is FileWelder really free?

Yes. All 65 tools are free for up to 3 files per batch with no limits.

Are my files uploaded to a server?

No. All processing happens locally in your browser.

What file formats are supported?

Images, PDFs, CSV, JSON, plain text, and GPX files.

Can I use FileWelder offline?

Yes. Install as a PWA for offline use.

Is there a file size limit?

No artificial limit. Bound by browser memory.

How is this different from other online tools?

FileWelder processes everything locally.

Convert Image Format Online

How It Works

Supported Formats

Frequently Asked Questions

Related Tools

FileWelder

The batch file processor that runs entirely in your browser

Why FileWelder?

Private by Design

Instant Processing

One Tool, Many Formats

No Installation

How It Works

Drop Files

Pick a Tool

Save Results

All 65 Tools

▸

Who Uses FileWelder?

Photos & Graphics

Code & Data

Tracks & Routes

Documents & PDFs

How FileWelder Compares

Transparency

Frequently Asked Questions

All 65 Tools