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2023 to today

Our History

From a personal text-to-speech workflow to a connected AI speech and localization platform.

Founder's note

Building useful, dependable AI workflows

I started TTS For Free after struggling with fragmented AI voice tools while creating YouTube content. Rather than build another standalone text-to-speech website, I wanted to simplify the broader content localization workflow.

Over time, the project expanded from a simple TTS tool into a platform covering subtitle generation, speech synthesis, translation, document processing, multi-speaker audio, and video localization.

Today, TTS For Free serves users around the world and continues to evolve through constant iteration, infrastructure improvements, and feedback from creators, educators, developers, and businesses.

Infrastructure for the next stage

We continuously invest in background processing, caching, distributed workers, and scalable infrastructure to keep AI generation responsive and reliable as the platform grows.

Release timeline

Key product, infrastructure, and workflow milestones recorded as the platform evolved.

⏱️SRT-to-Speech Speed Adjustment

  • •Added adjustable minimum and maximum speech-rate controls for SRT-to-Speech.
  • •Completed jobs can now be re-aligned from History with up to two free speed-adjustment retries.
🎙️ Try SRT-to-Speech

🔄New Subtitle Conversion Toolkit

  • •Launched four browser-based tools: SRT to TXT, SRT to VTT, VTT to SRT, and TXT to SRT.
  • •Subtitle files can now be converted locally with faster validation and no upload required.
📝 Open Subtitle Tools

🛡️More Reliable TTS and Video Workflows

  • •Added automatic retry handling for failed TTS blocks.
  • •Improved step tracking and continuation across the Video Localization workflow.
🎬 Open Video Localization

🎨SRT-to-Speech Experience Redesign

  • •Redesigned the SRT-to-Speech workspace for a clearer upload, voice-selection, preview, and generation flow.
  • •Improved the history interface and mobile experience across TTS tools.
📄 Open SRT-to-Speech

✨Gemini Transcription Provider

  • •Added Gemini as a new speech-to-text provider for generating subtitles from video.
  • •Expanded transcription choices while keeping the existing Video-to-SRT workflow.
🎥 Try Video-to-SRT

🔊Original Audio Volume Control

  • •Added an original-audio volume setting to Video Localization.
  • •The selected mix level is now preserved through final video rendering and shown in History.
🎞️ Try Video Localization

📈July Traffic Milestone

  • •Monthly active users reached 6,000 (MAU).
  • •Total registered users reached 8,265.

🎞️Video and Subtitle Workflow Improvements

  • •Redesigned the Video-to-SRT and Video Localization interfaces for a clearer workflow.
  • •Improved subtitle rendering and timing when merging localized audio into the final video.
🎬 Open Video Localization

🌐Provider Language Visibility

  • •Added provider-specific supported-language data.
  • •Voice selection now makes language compatibility easier to check before generating audio.
🎙️ Explore Available Voices

🎭Emotional Dubbing and Gemini Expansion

  • •Launched a dedicated AI Emotional Dubbing experience with interactive examples.
  • •Expanded Gemini voice support to Multi-Voice TTS and SRT-to-Speech.
🎭 Explore Emotional Dubbing

🤝Affiliate Program Launch

  • •Launched referral tracking, commission management, and withdrawal requests.
  • •Users can now share a referral link and earn commission from successful referred payments.
💸 Explore the Affiliate Program

🎬Video Localization Launch

  • •Launched the end-to-end Video Localization workflow for transcription, translation, speech generation, and final video merging.
  • •Moved heavy transcription and video merging tasks to workers for more stable background processing.
🌍 Localize a Video

🔁TTS Retry and Recovery Controls

  • •Added retry controls for merged TTS jobs directly from History.
  • •Improved translation fallback and audio-block recovery for interrupted jobs.
🎧 Open Multi-Voice TTS

🧰Operations and Usage Management

  • •Added user-management, credit-log, and job-log dashboards for faster support and issue investigation.
  • •Expanded feedback and notification tools to improve communication with users.

📊User Dashboard Launch

  • •Added a private dashboard for logged-in users to track credits, jobs, TTS usage, and activity trends.
📊 Open User Dashboard

🚀June Traffic Milestone

  • •Monthly active users reached 7,100.
  • •Total registered users climbed to 6,700.

⚖️Translation Model Cost Protection

  • •Updated translation options by hiding the most expensive model.
  • •This change helps users avoid heavy credit usage and unusually high output token costs.
🌍 Try Translation Tool

🧠Ask AI with RAG Support

  • •Added RAG-powered Ask AI support to help users find answers faster.
  • •The assistant can now search the FAQ knowledge base and return more relevant guidance.
🧠 Open Ask AI Assistant

📈May Traffic Milestone

  • •Monthly active users reached 6,500.
  • •Total registered users passed 6,000.

🎁30/4 Promotion Campaign

  • •Added a special promotion campaign for April 30.
  • •The promotion period was extended through the end of May.

⭐Favorite Voices & Recent Voice History

  • •Added saved favorite voices for TTS.
  • •Added recent voice history so users can quickly reuse recently selected voices.
🎙️ Try Multi-Voice TTS

🎙️Gemini Voice for Multi-Speaker TTS

  • •Added Gemini Voice TTS support for the multi-speaker workflow.
  • •Expanded voice options for building richer dialogue-style audio.
🎭 Try Multi-Speaker TTS

🎯Translation Accuracy Models

  • •Added 3 translation models: default, medium, and high, offering different levels of accuracy.

🚀April Traffic Milestone

  • •Reached 7,000 monthly active users (MAU).
  • •Registrations climbed to 3,900 users.

🎨Translate UI & Azure TTS Forge

  • •Updated the Translate UI for better user experience.
  • •Added TTS Forge for Azure with an improved, easy-to-use interface.
📷 Try Azure TTS Forge SSML

🎞️Improved Video-to-SRT

  • •Added a new, more accurate model for converting video to SRT.
🎥 Try Video-to-SRT

📑Dedicated SRT Translator

  • •Separated the SRT Translator feature to make it easier to save translation history without losing data.
📑 Try SRT Translator

🌐Browser Voice for AI Chat

  • •Updated AI Voice Chat to use browser-based voices, helping users save their free credits.
📷 Try AI Voice Chat

ℹ️SRT-to-Speech Guide

  • •Added step-by-step instructional guides directly on the SRT-to-Speech page.

🎙️Recording, Summary & Translation

  • •Added conversation recording feature with automatic summary and translation.
  • •Free usage available up to 30 minutes per day.
🎤 Try Recording, Summary & Translation

🗣️Google TTS SSML Support

  • •Added SSML input feature for Google TTS, allowing deeper control over voice inflection and pacing.
📷 Try Google TTS SSML

📷OCR Improvements

  • •Improved OCR feature for extracting text from images.
  • •Optimized upload handling and processing performance.
  • •Prepared integration flow from OCR → Text → Text-to-Speech.
📷 Try OCR Tool

🎤Speech-to-Text Recording & AI Summary

  • •Added direct audio recording inside the Speech-to-Text page.
  • •Integrated automatic AI summary for transcripts.
  • •Improved workflow for converting speech into structured text.
🎤 Try Speech to Text

📈SEO Structure Optimization

  • •Improved meta generation and SEO metadata handling.
  • •Optimized blog indexing and search visibility.
  • •Enhanced internal linking between AI tools.

📝AI Blog System

  • •Added AI-generated blog content to expand educational resources.
  • •Improved article structure with table of contents.
  • •Optimized blog URL structure for better SEO.

📊March Traffic Milestone

  • •Reached 6,100 monthly active users (MAU).
  • •Noted 2,457 registered users.

📚Blog SEO & Content Improvements

  • •Improved blog meta handling and performance.
  • •Added automatic Table of Contents generation.
  • •Optimized blog URLs for better indexing.

⬇️Download Format Improvements

  • •Improved export formats for generated files.
  • •Enhanced download experience for subtitle and audio tools.

🎬New Subtitle Tools

  • •Added MP3 → SRT conversion tool.
  • •Added Text → SRT generator.
  • •Added PDF → SRT support for subtitle creation.

🎨UI & FAQ Improvements

  • •Improved frontend UI for multiple tools.
  • •Updated FAQ and client information pages.
  • •Enhanced user experience across tool pages.

🌍SRT Translation Feature

  • •Added SRT file translation directly inside the SRT-to-Speech page.
  • •Users can now translate subtitle files before generating audio.
  • •Improved workflow for multilingual video creators.
🌐 Try SRT Translate

💰AdSense Approval 🎉

  • •Officially approved for monetization.
  • •Ads enabled just days before Lunar New Year — an unforgettable milestone.
  • •Marked the first sustainable revenue signal for the platform.

🚀Major UX & Feature Expansion

  • •Added Dark Mode based on user feedback.
  • •Enabled direct mobile camera access for OCR uploads.
  • •Redesigned SaaS-style left sidebar for a cleaner interface.
  • •Launched Document-to-Speech feature.
  • •Expanded supported upload formats beyond PDF (PDF, DOCX, EPUB, TXT and more).

📈Pre-Lunar New Year Roadmap Update

  • •Reviewed and updated the end-to-end product development workflow.
  • •Evaluating long-term sustainability and system infrastructure scaling options.

📈Pre-Lunar New Year Roadmap Update

  • •Reviewed and updated the end-to-end product development workflow.
  • •Evaluating long-term sustainability and system infrastructure scaling options.

🛠Gemini Voices Experiment & Cost Analysis

  • •Integrated Gemini Voices but decided to deprecate the feature shortly after.
  • •Key Lesson: High latency causing constant retries made cost estimation unpredictable.
  • •Decision: Reverted the feature to protect the operational budget from billing spikes.

📊February Traffic Milestone

  • •Reached 5,700 Monthly Active Users (MAU).
  • •Official member count reached 1,740 registered users.

📖Launch of Educational Blog Series

  • •Problem Solved: Helping users choose between OpenAI, Gemini, Azure, and Google TTS.
  • •Optimization Guide: Recommended Google voices for multilingual content (EN-VN mix) for stability and cost-efficiency.
📚 Read the full guide series

✨Browser TTS & Text Highlighting

  • •Released Client-side Text-to-Speech with real-time word highlighting.
  • •Connected PDF/OCR => Text => Browser TTS as a no-credit reading workflow.
  • •Expanded accessible reading options for students and the learning community.
🎧 Try Free TTS Reader

🎙️OpenAI Voice Integration

  • •Key Benefit: Exceptional multilingual AI voices with very competitive pricing.
  • •Providing high-fidelity options for professional content creators.

🎬SRT-to-Speech & Video Synthesis Research

  • •Supported timestamp-based reading to assist video creators with dubbing.
  • •Experimented with an all-in-one flow (OCR + MP3 + Images => Video) using queues.
  • •Technical Shift: Developed a private WPF desktop application to handle heavy video processing, keeping server resources optimized.
🎥 Try SRT-to-Speech

🔗Social Share Link Feature

  • •Improved Workflow: Replaced 'Convert => Download => Send' with direct sharing.
  • •UX Update: Integrated a web player so recipients can listen and read text instantly.

🧠Smart Language Detection

  • •Integrated automatic language detection based on character analysis.
  • •Technical Challenge: Resolved identification overlaps between Vietnamese and Spanish characters.

🎊New Year & Traffic Growth

  • •Achieved 4,400 Monthly Active Users (MAU).
  • •Surpassed 1,046 registered members.
  • •Sent a New Year's Eve broadcast message to all online users at 00:00.

🔔Notification System & Editor Lab

  • •Launched a real-time notification bell for feature updates.
  • •Experimental Editor: Tested an automated video previewer syncing OCR text with audio, currently kept in 'internal-only' mode for further optimization.

💳Local Payments & Voice Library

  • •Officially supported donations via Vietnamese Bank QR Code transfers.
  • •Launched /voice-library, featuring 12 popular languages including English, Vietnamese, Portuguese, and more.
🎤 Explore Voice Library

📚PDF-to-Speech & Multi-voice Chat

  • •PDF-to-Speech: Allowing users to select and listen to specific pages.
  • •Multi-voice Dialog: Support for podcast scripts with smart roles, pause, and speed controls.
  • •Conversion History: Users can now easily retrieve and replay previous multi-voice tasks.
📄 Try PDF-to-Speech

⚙️API & CDN Architecture Optimization

  • •Eliminated local temporary file storage to optimize server resources.
  • •Migrated to a direct API response system following CDN standards.

🅿️First Global Donation via PayPal

  • •Integrated PayPal for international users.
  • •Received first contributions to help sustain server and infrastructure costs.

📷OCR Feature Launch

  • •Integrated high-accuracy image/document scanning (OCR).
  • •Implemented daily limits to ensure system stability and long-term sustainability.
📸 Try OCR Scanner

📖Library Digitization: Google Books & Gutendex

  • •Connected Google Books API for availability checks across 1M+ sources.
  • •Integrated Gutendex to help users search and read free public domain books.

💬AI Voice Chat V1

  • •Utilized OpenAI models for English learning through voice interaction.
  • •Implemented Session Persistence for more contextual and natural conversations.

🔍SEO & Analytics Foundations

  • •Launched SEO-optimized blog interface with Google Search Console and GA4.
  • •Deployed Cloudflare CDN for thumbnail and image delivery optimization.

🏗️The Project Re-birth (Rebuild)

  • •Migrated system to a private VPS, redeploying the stack from scratch.
  • •Mindset Shift: Focusing on learning and experimenting with cutting-edge tech.

⚠️Pause & Infrastructure Reassessment

  • •Reassessed the hosting architecture after the initial Google Cloud trial ended.
  • •Paused feature work while transitioning professional roles and planning a more sustainable rebuild.

💻Tech Stack Transition

  • •Migrated from Python Desktop App to a Web platform (Next.js + .NET Core).
  • •Deployed Beta on Google Cloud with Azure & Google TTS integration.

🎬The YouTuber's Struggle

  • •Worked through the limits and fragmented workflows of early speech tools while producing story review videos.
  • •Key realization: if the workflow was difficult for a developer, it would be even harder for everyday creators.
  • •Built a Python pipeline on Google Colab for personal large-scale conversion.

Frequently Asked Questions

Q: Why was TTS For Free created?

A: The project began from a real content-creation workflow. Its founder wanted to reduce the friction of switching between separate tools for OCR, translation, subtitles, and AI speech.

Q: How has the platform evolved since 2023?

A: TTS For Free grew from a personal Python-based TTS workflow into a web platform for speech generation, subtitles, translation, documents, transcription, multi-speaker audio, and video localization.

Q: What guides the engineering of TTS For Free?

A: Development prioritizes reliability, practical connected workflows, privacy-aware architecture, transparent pricing, and continuous optimization for performance and scalability.

Q: Is TTS For Free still actively developed?

A: Yes. The timeline records ongoing releases across voice generation, subtitle processing, translation, document tools, video workflows, infrastructure, and user experience.

Built and continuously improved by TTS For Free.