We are a Swiss Army knife for your files
Transloadit is a service for companies with developers. We handle their file uploads and media processing. This means that they can save on development time and the heavy machinery that is required to handle big volumes in an automated way.
We pioneered with this concept in 2009 and have made our customers happy ever since. We are still actively improving our service in 2025, as well as our open source projects uppy.io and tus.io, which are changing how the world does file uploading.
Add text overlay to videos
Adding text overlays to videos is a powerful way to enhance your content with titles, subtitles, watermarks, or other textual information.
This demo shows how to use FFmpeg's drawtext
filter via the
ffmpeg
parameter to add text overlays to your videos. We demonstrate two approaches:
using the default font and using a custom font.
Key Features
-
Text Positioning: Center the text using dynamic expressions like
x=(w-text_w)/2
andy=(h-text_h)/2
- Background Box: Add a semi-transparent background box behind the text for better readability
- Font Selection: Use the default Sans font or specify custom fonts like 'Times New Roman'
- Styling Options: Control font color, size, box color, transparency, and border width
Important Notes
-
When specifying custom fonts, use the
font
parameter (notfontpath
) - Font names for FFmpeg may differ from ImageMagick conventions - use spaces instead of dashes (e.g., 'Times New Roman' not 'Times-New-Roman')
-
The
preset: "empty"
ensures no additional encoding is applied beyond the text overlay - Use
codec:a: "copy"
to preserve the original audio without re-encoding
You can customize the text, position, font, colors, and many other properties by modifying the
vf
(video filter) parameter. See the
FFmpeg drawtext documentation for
all available options.
Step 1:
Handle uploads
We can handle uploads of your users directly. Learn more ›
22s · 1280 × 720
Step 2:
Transcode videos to original codec Settings
We offer a variety of video encoding features like optimizing for different devices, merging, injecting ads, changing audio tracks, or adding company logos. Learn more ›
22s · 1280 × 720
Step 3:
Transcode videos to original codec Settings
22s · 1280 × 720
Step 4:
Export files to Amazon S3
We export to the storage platform of your choice. Learn more ›
Once all files have been exported, we can ping a URL of your choice with the Assembly status JSON.
Build this in your own language
// implementation 'com.transloadit.sdk:transloadit:1.0.0'
import com.transloadit.sdk.Assembly;
import com.transloadit.sdk.Transloadit;
import com.transloadit.sdk.exceptions.LocalOperationException;
import com.transloadit.sdk.exceptions.RequestException;
import com.transloadit.sdk.response.AssemblyResponse;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) {
// Initialize the Transloadit client
Transloadit transloadit = new Transloadit("YOUR_TRANSLOADIT_KEY", "MY_TRANSLOADIT_SECRET");
Assembly assembly = transloadit.newAssembly();
// Set Encoding Instructions
Map<String, Object> _originalStepOptions = new HashMap();
assembly.addStep(":original", "/upload/handle", _originalStepOptions);
Map<String, Object> text_overlay_defaultStepOptions = new HashMap();
text_overlay_defaultStepOptions.put("use", ":original");
text_overlay_defaultStepOptions.put("preset", "empty");
text_overlay_defaultStepOptions.put("ffmpeg", {
"codec:a": "copy",
"vf": "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
});
text_overlay_defaultStepOptions.put("result", true);
text_overlay_defaultStepOptions.put("ffmpeg_stack", "v6.0.0");
assembly.addStep("text_overlay_default", "/video/encode", text_overlay_defaultStepOptions);
Map<String, Object> text_overlay_customStepOptions = new HashMap();
text_overlay_customStepOptions.put("use", ":original");
text_overlay_customStepOptions.put("preset", "empty");
text_overlay_customStepOptions.put("ffmpeg", {
"codec:a": "copy",
"vf": "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
});
text_overlay_customStepOptions.put("result", true);
text_overlay_customStepOptions.put("ffmpeg_stack", "v6.0.0");
assembly.addStep("text_overlay_custom", "/video/encode", text_overlay_customStepOptions);
Map<String, Object> exportedStepOptions = new HashMap();
exportedStepOptions.put("use", new String[] { "text_overlay_default", "text_overlay_custom", ":original" });
exportedStepOptions.put("credentials", "demo_s3_credentials");
exportedStepOptions.put("url_prefix", "https://demos.transloadit.com/");
assembly.addStep("exported", "/s3/store", exportedStepOptions);
// Add files to upload
assembly.addFile(new File("surf.mp4"));
// Start the Assembly
try {
AssemblyResponse response = assembly.save();
// Wait for Assembly to finish executing
while (!response.isFinished()) {
response = transloadit.getAssemblyByUrl(response.getSslUrl());
}
System.out.println(response.getId());
System.out.println(response.getUrl());
System.out.println(response.json());
} catch (RequestException | LocalOperationException e) {
// Handle exception here
}
}
}
// go get gopkg.in/transloadit/go-sdk.v1
package main
import (
"context"
"fmt"
"github.com/transloadit/go-sdk"
)
func main() {
// Create client
options := transloadit.DefaultConfig
options.AuthKey = "YOUR_TRANSLOADIT_KEY"
options.AuthSecret = "MY_TRANSLOADIT_SECRET"
client := transloadit.NewClient(options)
// Initialize new Assembly
assembly := transloadit.NewAssembly()
// Set Encoding Instructions
assembly.AddStep(":original", map[string]interface{}{
"robot": "/upload/handle",
})
assembly.AddStep("text_overlay_default", map[string]interface{}{
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": map[string]interface{}{
"codec:a": "copy",
"vf": "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
},
"result": true,
"ffmpeg_stack": "v6.0.0",
})
assembly.AddStep("text_overlay_custom", map[string]interface{}{
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": map[string]interface{}{
"codec:a": "copy",
"vf": "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
},
"result": true,
"ffmpeg_stack": "v6.0.0",
})
assembly.AddStep("exported", map[string]interface{}{
"use": ["text_overlay_default", "text_overlay_custom", ":original"],
"robot": "/s3/store",
"credentials": "demo_s3_credentials",
"url_prefix": "https://demos.transloadit.com/",
})
// Add files to upload
assembly.AddFile("surf.mp4"))
// Start the Assembly
info, err := client.StartAssembly(context.Background(), assembly)
if err != nil {
panic(err)
}
// All files have now been uploaded and the Assembly has started but no
// results are available yet since the conversion has not finished.
// WaitForAssembly provides functionality for polling until the Assembly
// has ended.
info, err = client.WaitForAssembly(context.Background(), info)
if err != nil {
panic(err)
}
fmt.Printf("You can check some results at: ")
fmt.Printf(" - %s\n", info.Results[":original"][0].SSLURL)
fmt.Printf(" - %s\n", info.Results["text_overlay_default"][0].SSLURL)
fmt.Printf(" - %s\n", info.Results["text_overlay_custom"][0].SSLURL)
fmt.Printf(" - %s\n", info.Results["exported"][0].SSLURL)
}
# pip install pytransloadit
from transloadit import client
tl = client.Transloadit('YOUR_TRANSLOADIT_KEY', 'MY_TRANSLOADIT_SECRET')
assembly = tl.new_assembly()
# Set Encoding Instructions
assembly.add_step(":original", "/upload/handle", {})
assembly.add_step("text_overlay_default", "/video/encode", {
'use': ':original',
'preset': 'empty',
'ffmpeg': {
'codec:a': 'copy',
'vf': 'drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2'
},
'result': True,
'ffmpeg_stack': 'v6.0.0'
})
assembly.add_step("text_overlay_custom", "/video/encode", {
'use': ':original',
'preset': 'empty',
'ffmpeg': {
'codec:a': 'copy',
'vf': 'drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2'
},
'result': True,
'ffmpeg_stack': 'v6.0.0'
})
assembly.add_step("exported", "/s3/store", {
'use': ['text_overlay_default', 'text_overlay_custom', ':original'],
'credentials': 'demo_s3_credentials',
'url_prefix': 'https://demos.transloadit.com/'
})
# Add files to upload
assembly.add_file(open('surf.mp4', 'rb'))
# Start the Assembly
assembly_response = assembly.create(retries=5, wait=True)
print(assembly_response.data.get('assembly_ssl_url'))
# or:
print(assembly_response.data['assembly_ssl_url'])
# gem install transloadit
# $ irb -rubygems
# >> require 'transloadit'
# => true
transloadit = Transloadit.new([
:key => "YOUR_TRANSLOADIT_KEY"
])
# Set Encoding Instructions
_original = transloadit.step(":original", "/upload/handle", {})
text_overlay_default = transloadit.step("text_overlay_default", "/video/encode", [
:use => ":original",
:preset => "empty",
:ffmpeg => [
:"codec:a" => "copy",
:vf => "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
],
:result => true,
:ffmpeg_stack => "v6.0.0"
])
text_overlay_custom = transloadit.step("text_overlay_custom", "/video/encode", [
:use => ":original",
:preset => "empty",
:ffmpeg => [
:"codec:a" => "copy",
:vf => "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
],
:result => true,
:ffmpeg_stack => "v6.0.0"
])
exported = transloadit.step("exported", "/s3/store", [
:use => ["text_overlay_default", "text_overlay_custom", ":original"],
:credentials => "demo_s3_credentials",
:url_prefix => "https://demos.transloadit.com/"
])
transloadit.assembly([
:steps => [_original, text_overlay_default, text_overlay_custom, exported]
])
# Add files to upload
files = []
files.push("surf.mp4")
# Start the Assembly
response = assembly.create! *files
until response.finished?
sleep 1; response.reload!
end
if !response.error?
# handle success
end
// composer require transloadit/php-sdk
use transloadit\Transloadit;
$transloadit = new Transloadit([
"key" => "YOUR_TRANSLOADIT_KEY",
"secret" => "MY_TRANSLOADIT_SECRET",
]);
// Start the Assembly
$response = $transloadit->createAssembly([
"files" => ["surf.mp4"],
"params" => [
"steps" => [
":original" => [
"robot" => "/upload/handle",
],
"text_overlay_default" => [
"use" => ":original",
"robot" => "/video/encode",
"preset" => "empty",
"ffmpeg" => [
"codec:a" => "copy",
"vf" => "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
],
"result" => true,
"ffmpeg_stack" => "v6.0.0",
],
"text_overlay_custom" => [
"use" => ":original",
"robot" => "/video/encode",
"preset" => "empty",
"ffmpeg" => [
"codec:a" => "copy",
"vf" => "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2",
],
"result" => true,
"ffmpeg_stack" => "v6.0.0",
],
"exported" => [
"use" => ["text_overlay_default", "text_overlay_custom", ":original"],
"robot" => "/s3/store",
"credentials" => "demo_s3_credentials",
"url_prefix" => "https://demos.transloadit.com/",
],
],
],
]);
# [sudo] npm install transloadify -g
# Auth
export TRANSLOADIT_KEY="YOUR_TRANSLOADIT_KEY"
# Save Encoding Instructions
echo '{
"steps": {
":original": {
"robot": "/upload/handle"
},
"text_overlay_default": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"text_overlay_custom": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"exported": {
"use": ["text_overlay_default", "text_overlay_custom", ":original"],
"robot": "/s3/store",
"credentials": "demo_s3_credentials",
"url_prefix": "https://demos.transloadit.com/"
}
}
}' > ./steps.json
# Execute
transloadify \
--input "surf.mp4" \
--steps "./steps.json" \
--output "./output.example"
// yarn add transloadit || npm i transloadit
// Import
import { Transloadit } from 'transloadit'
const main = async () => {
// Init
const transloadit = new Transloadit({
authKey: 'YOUR_TRANSLOADIT_KEY',
authSecret: 'MY_TRANSLOADIT_SECRET',
})
// Set Encoding Instructions
const options = {
files: {
myfile_1: './surf.mp4',
},
params: {
steps: {
':original': {
robot: '/upload/handle',
},
text_overlay_default: {
use: ':original',
robot: '/video/encode',
preset: 'empty',
ffmpeg: {
'codec:a': 'copy',
vf: 'drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2',
},
result: true,
ffmpeg_stack: 'v6.0.0',
},
text_overlay_custom: {
use: ':original',
robot: '/video/encode',
preset: 'empty',
ffmpeg: {
'codec:a': 'copy',
vf: 'drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2',
},
result: true,
ffmpeg_stack: 'v6.0.0',
},
exported: {
use: ['text_overlay_default', 'text_overlay_custom', ':original'],
robot: '/s3/store',
credentials: 'demo_s3_credentials',
url_prefix: 'https://demos.transloadit.com/',
},
},
},
}
// Execute
const result = await transloadit.createAssembly(options)
// Show results
console.log({ result })
}
main().catch(console.error)
<!-- This pulls Uppy from our CDN -->
<!-- For smaller self-hosted bundles, install Uppy and plugins manually: -->
<!-- npm i --save @uppy/core @uppy/dashboard @uppy/remote-sources @uppy/transloadit ... -->
<link
href="https://releases.transloadit.com/uppy/v4.3.1/uppy.min.css"
rel="stylesheet"
/>
<button id="browse">Select Files</button>
<script type="module">
import {
Uppy,
Dashboard,
ImageEditor,
RemoteSources,
Transloadit,
} from 'https://releases.transloadit.com/uppy/v4.3.1/uppy.min.mjs'
const uppy = new Uppy()
.use(Transloadit, {
waitForEncoding: true,
alwaysRunAssembly: true,
assemblyOptions: {
params: {
// To avoid tampering, use Signature Authentication:
// https://transloadit.com/docs/api/authentication/
auth: {
key: 'YOUR_TRANSLOADIT_KEY',
},
// It's often better store encoding instructions in your account
// and use a `template_id` instead of adding these steps inline
steps: {
':original': {
robot: '/upload/handle',
},
text_overlay_default: {
use: ':original',
robot: '/video/encode',
preset: 'empty',
ffmpeg: {
'codec:a': 'copy',
vf: 'drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2',
},
result: true,
ffmpeg_stack: 'v6.0.0',
},
text_overlay_custom: {
use: ':original',
robot: '/video/encode',
preset: 'empty',
ffmpeg: {
'codec:a': 'copy',
vf: 'drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2',
},
result: true,
ffmpeg_stack: 'v6.0.0',
},
exported: {
use: ['text_overlay_default', 'text_overlay_custom', ':original'],
robot: '/s3/store',
credentials: 'demo_s3_credentials',
url_prefix: 'https://demos.transloadit.com/',
},
},
},
},
})
.use(Dashboard, { trigger: '#browse' })
.use(ImageEditor, { target: Dashboard })
.use(RemoteSources, {
companionUrl: 'https://api2.transloadit.com/companion',
})
.on('complete', ({ transloadit }) => {
// Due to `waitForEncoding:true` this is fired after encoding is done.
// Alternatively, set `waitForEncoding` to `false` and provide a `notify_url`
console.log(transloadit) // Array of Assembly Statuses
transloadit.forEach((assembly) => {
console.log(assembly.results) // Array of all encoding results
})
})
.on('error', (error) => {
console.error(error)
})
</script>
// Install via Swift Package Manager:
// dependencies: [
// .package(url: "https://github.com/transloadit/TransloaditKit", .upToNextMajor(from: "3.0.0"))
// ]
// Or via CocoaPods:
// pod 'Transloadit', '~> 3.0.0'
// Auth
let credentials = Credentials(key: "YOUR_TRANSLOADIT_KEY")
// Init
let transloadit = Transloadit(credentials: credentials, session: "URLSession.shared")
// Add files to upload
let filesToUpload: [URL] = ...
// Execute
let assembly = transloadit.assembly(steps: [_originalStep, text_overlay_defaultStep, text_overlay_customStep, exportedStep], andUpload: filesToUpload) { result in
switch result {
case .success(let assembly):
print("Retrieved (assembly)")
case .failure(let error):
print("Assembly error (error)")
}
}.pollAssemblyStatus { result in
switch result {
case .success(let assemblyStatus):
print("Received assemblystatus (assemblyStatus)")
case .failure(let error):
print("Caught polling error (error)")
}
# Prerequisites: brew install curl jq || sudo apt install curl jq
# To avoid tampering, use Signature Authentication
echo '{
"auth": {
"key": "YOUR_TRANSLOADIT_KEY"
},
"steps": {
":original": {
"robot": "/upload/handle"
},
"text_overlay_default": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"text_overlay_custom": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"exported": {
"use": ["text_overlay_default", "text_overlay_custom", ":original"],
"robot": "/s3/store",
"credentials": "demo_s3_credentials",
"url_prefix": "https://demos.transloadit.com/"
}
}
}' | curl \
--request POST \
--form 'params=<-' \
--form myfile1=@./surf.mp4 \
https://api2.transloadit.com/assemblies | jq
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"text_overlay_default": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"text_overlay_custom": {
"use": ":original",
"robot": "/video/encode",
"preset": "empty",
"ffmpeg": {
"codec:a": "copy",
"vf": "drawtext=font='Times New Roman':text='My text overlay':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"
},
"result": true,
"ffmpeg_stack": "v6.0.0"
},
"exported": {
"use": ["text_overlay_default", "text_overlay_custom", ":original"],
"robot": "/s3/store",
"credentials": "demo_s3_credentials",
"url_prefix": "https://demos.transloadit.com/"
}
}
}
So many ways to integrate
-
Bulk imports
Add one of our import Robots to acquire and transcode massive media libraries. -
Handling uploads
We are the experts at reliably handling uploads. We wrote the protocol for it. -
Front-end integration
We integrate with web browsers via our next-gen file uploader Uppy and SDKs for Android and iOS. -
Back-end integration
-
Pingbacks
Configure anotify_url
to let your server receive transcoding results JSON in thetransloadit
POST field. -
On-demand
Use our Smart CDN to adapt files on-demand and stream them directly to your users.