Deploy and Host Transmute — Self-Hosted File Converter on Railway

Transmute is a free, open-source, self-hosted file converter with 2,000+ supported format conversions — images, video, audio, documents, spreadsheets, subtitles, fonts, and structured data — served through a polished web UI and a fully documented REST API. No file size limits. No watermarks. No files uploaded to third-party servers. No per-conversion billing.

Deploy once on Railway and run unlimited conversions at a flat ~$5/month — versus CloudConvert at $0.016 per conversion minute or Convertio at $9.99/month with format restrictions.

What This Template Deploys

Single-service architecture. No database service, no Redis, no inter-service networking.

About Hosting Transmute

Cloud file conversion services like CloudConvert and Convertio process your files on their own servers — your documents, media, and data leave your infrastructure on every conversion. Credit-based billing means costs scale unpredictably: a single PDF-to-Office conversion costs 4 CloudConvert credits, and high-volume usage compounds quickly.

Transmute runs entirely on Railway's managed infrastructure. Every conversion happens inside your own container — files never leave your instance. The built-in REST API makes it straightforward to integrate with n8n, Make, or any backend service. Built-in authentication with per-user data isolation means you can safely deploy for a team without cross-user file access.

Typical cost: ~$5/month on Railway's Hobby plan — flat, unlimited conversions with no credit system, no format surcharges, and no file size caps.

Deploy in Under 3 Minutes

1. Click Deploy on Railway — Transmute builds and deploys automatically (~2–3 minutes)
2. Open your Railway-assigned URL — the Transmute web UI loads immediately
3. Create your admin account on first launch
4. Start converting files via the browser UI or API

No SSH. No Docker configuration. No dependencies to install.

Common Use Cases

• Self-hosted alternative to CloudConvert — run unlimited conversions at ~$5/month flat instead of paying $0.016 per conversion minute; no credit caps, no PDF surcharges, no files uploaded to CloudConvert's servers
• Self-hosted alternative to Convertio — get 2,000+ format support versus Convertio's 300 formats, with no monthly conversion cap and full data ownership
• Automated file conversion pipeline — call the REST API from n8n, Make, or any backend workflow to convert files programmatically without a third-party API key or credit system
• Private document conversion for teams — deploy for your organisation with built-in user accounts and per-user data isolation; converted files never leave your Railway instance
• Media processing for developers — integrate image, video, and audio conversion directly into your application via the OpenAPI-documented REST endpoint
• Batch format migration — convert large volumes of legacy documents, spreadsheets, or media files in bulk through the API without triggering per-conversion billing

Supported Conversions

Transmute supports 2,000+ conversion combinations across these file categories:

Full conversion compatibility matrix: transmute.sh/conversions

Configuration

Transmute vs. Cloud File Conversion Services

Dependencies for Transmute Hosting

• Railway account — Hobby plan (~$5/month) is all that's required
• No external API keys, no database, no third-party services

Deployment Dependencies

• Transmute GitHub Repository — source and releases
• Transmute Documentation — full configuration reference
• Conversion Compatibility Matrix — all 2,000+ supported formats
• Transmute OpenAPI Spec — REST API reference
• Railway Volumes Documentation — persistent storage setup

Implementation Details

This template deploys Transmute from the official container image at ghcr.io/transmute-app/transmute with a Railway persistent volume for file handling during conversions. All processing happens inside the container — files are never transmitted to external services. The web UI and REST API are served on the same port behind Railway's automatic HTTPS proxy.

Built-in authentication supports user account creation, password management, and API token generation — making it suitable for both personal single-user deployments and shared team instances with per-user data isolation. The OpenAPI-documented REST endpoint accepts file uploads and returns converted output, making it straightforward to integrate with any HTTP client, n8n workflow, or backend service.

Frequently Asked Questions

How much does Transmute cost on Railway vs CloudConvert? Transmute on Railway runs at ~$5/month flat with unlimited conversions and no file size caps. CloudConvert charges $0.016 per conversion minute — PDF-to-Office conversions cost 4 credits minimum, so at moderate volume costs escalate quickly. Convertio starts at $9.99/month with format restrictions. Transmute gives you 2,000+ format support at a flat compute cost.

Do my files leave my infrastructure during conversion? No. Every conversion happens inside your Railway container. Files are uploaded to your instance, converted locally, and returned to you. No file data is transmitted to any third-party service. This makes Transmute suitable for sensitive documents, internal business files, and privacy-regulated data.

Can I use Transmute's API from n8n or Make? Yes. Transmute exposes a fully documented REST API (OpenAPI spec available). Use any HTTP request node in n8n or Make to POST a file to your Railway URL and receive the converted output. Authenticate API calls using the token generated in your Transmute account settings.

Is there a file size limit? No hard limit is set by default. Practical limits depend on your Railway service's memory allocation — larger video and document conversions require more RAM. Increase your Railway service's memory in the service settings if you're converting large files regularly.

How do I restrict access to my Transmute instance? Built-in authentication is enabled by default — users must create an account and log in before converting files. Set DEFAULT_ADMIN_EMAIL and DEFAULT_ADMIN_PASSWORD at deploy time to pre-configure the first admin account. Disable open registration in the admin panel to prevent new signups.

How do I update Transmute to a newer version? Update the image tag in your Railway service settings to the latest release (e.g. ghcr.io/transmute-app/transmute:latest or a pinned version tag) and trigger a redeploy. Check the GitHub releases page for breaking changes before updating.

Why Deploy Transmute on Railway?

Railway is a singular platform to deploy your infrastructure stack. Railway will host your infrastructure so you don't have to deal with configuration, while allowing you to vertically and horizontally scale it.

By deploying Transmute on Railway, you get a private file conversion service with 2,000+ supported formats, a REST API for automation, built-in user authentication, and zero per-conversion fees — all for ~$5/month with full ownership of your files and data.