ChangeThisFile vs PDF2Go: Which Online Converter Is Better?

PDF2Go is a well-known free web converter that's been around for years, with a focus on PDF-in and PDF-out conversions plus some PDF manipulation tools. It's ad-supported, free to use, and covers common document conversions reliably.

ChangeThisFile is a general-purpose converter: broader format coverage, client-side processing for privacy-sensitive files, and a developer API that PDF2Go lacks entirely. This comparison covers where each tool makes sense.

Quick verdict

For PDF conversions and PDF editing tools: Both work. PDF2Go focuses on PDF; ChangeThisFile handles it as one of many format categories.

For privacy-sensitive files: ChangeThisFile — images, data files, and fonts convert in your browser without uploading.

For non-PDF formats (video, audio, ebooks, archives): ChangeThisFile. PDF2Go's coverage is primarily PDF-centric.

For developer API access: ChangeThisFile only. PDF2Go has no API.

For ad-free experience: ChangeThisFile. PDF2Go is ad-supported.

Pricing comparison

PDF2Go has a paid tier that removes ads and increases conversion limits — it's priced low. ChangeThisFile's paid tiers are for API volume, not web tool access. The web converter is always unlimited and free on ChangeThisFile.

Feature comparison

Privacy and data handling

PDF2Go processes all conversions server-side. Files are uploaded to their servers, converted, and made available for download. They state files are deleted after a period, though the exact window varies. Like any server-side converter, your file leaves your device.

ChangeThisFile's client-side routes eliminate this concern for common formats. Images (JPG, PNG, WebP, GIF, BMP, ICO, AVIF, SVG, TIFF, HEIC, PSD), data formats (CSV, JSON, YAML, TOML, XML, TSV), spreadsheets (XLSX), DOCX→HTML, HTML↔Markdown, image-to-PDF, and fonts all process in your browser tab. Nothing is uploaded.

For server-side conversions (video, audio, complex documents, archives), ChangeThisFile uploads over HTTPS and auto-deletes after the file is returned.

API and developer experience

PDF2Go has no developer API. There's no way to programmatically convert files through PDF2Go without scraping the web interface, which is fragile and unsupported.

ChangeThisFile's API is designed to be used directly from the command line or any HTTP client — no SDK, no package to install:

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer ctf_sk_your_key" \
  -F "file=@document.docx" \
  -F "target=pdf" \
  --output document.pdf

The source format is auto-detected from the filename. Synchronous — the converted file comes back in the HTTP response. Get a free key at changethisfile.com/v1/keys/free.

Format coverage

PDF2Go covers PDF conversions well — documents to PDF, PDF to images, PDF to Word/Excel, and basic PDF manipulation (compress, merge, split, rotate, watermark). It has some image conversion support as well.

ChangeThisFile extends beyond PDF to 690 routes: all major image formats, video (MP4, MKV, WebM, AVI, MOV, FLV, WMV), audio (MP3, WAV, FLAC, AAC, M4A, OGG), ebooks (EPUB, MOBI, AZW3, FB2, CBR/CBZ), archives (ZIP, RAR, 7Z, TAR and all .tar.* variants), and fonts. All of PDF2Go's PDF conversions are covered within this set.

When to choose which

PDF2Go and ChangeThisFile are both solid free web converters with different strengths. PDF2Go has better PDF manipulation tools; ChangeThisFile has broader format coverage, client-side privacy, and a developer API. For most users doing more than just PDF work, ChangeThisFile is the better default — free, ad-free, and no signup required.