Convertisseur PDF : Modifier et signer des documents PDFen un clin d'oeil

Convertissez, divisez, fusionnez, modifiez et signez vos documents PDF en ligne sans inscription.

Sûr et sécurisé

Rapide et facile

Sans e-mails


Format de fichier

Format Nom du format de fichier Programmes utilisant ce format Auteur
doc Microsoft Word Binary File Format Microsoft Word (97-2010)
Apple Pages
Microsoft Word
IBM Lotus Symphony
docx Microsoft Word Open XML Document  Microsoft Word 2013
Corel WordPerfect X7
Apple Pages 5.2
MobiSystems OfficeSuite Pro 7
Google Drive
pdf Portable Document Format Adobe Viewer
Acrobat Reader
Adobe Systems
pages Pages Document Pages 4.0
Pages 4.1
Pages 4.2
iWork '09
Google Docs
Apple Inc.
jpg Joint Photographic Experts Group JFIF format Adobe Photoshop
Adobe Suite
Apple Preview
Corel Paint Shop Pro
Microsoft Office
Microsoft Windows Photo Gallery Viewer
Most web browsers
Joint Photographic Experts Group 
 jpeg Joint Photographic Experts Group JFIF format Adobe Photoshop
Corel Paint Shop Pro
Apple Preview
Microsoft Windows Photo Gallery Viewer
The JPEG Committee
png Portable Network Graphics Microsoft Windows Photos
Microsoft Paint
Adobe Photoshop CC
PNG Development Group (donated to W3C)
csv Comma Separated Values File Microsoft Excel
Microsoft Works
Corel Quattro Pro
Apache OpenOffice
Microsoft Notepad
Libre Office
MobiSystems OfficeSuite Pro 7
 xlsx Microsoft Excel Open XML Spreadsheet Microsoft Excel 2007
Open Office
Oxygen Office Progessional (Linux)
numbers Numbers Spreadsheet File Apple Numbers (Mac, Web & iOS) Apple Inc.
ppt Microsoft PowerPoint Presentation File Apple Keynote
Microsoft PowerPoint
 pptx  Microsoft PowerPoint 2007 XML Presentation Apple Keynote
Microsoft PowerPoint
html Hypertext Markup Language with a client-side image map Internet Explorer
Mozilla Firefox
Google Chrome
Other internet browsers
World Wide Web Consortium & WHATWG
url Internet shortcut file Apple Safari
Google Chrome
Microsoft Internet Explorer
Microsoft Word
Mozilla Firefox
Show more

Guide pratique :

Comment utiliser le convertisseur de PDF en ligne :

  1. Veuillez saisir dans la barre d'adresse de votre navigateur.
  2. Dans l'application, sélectionnez l'opération que vous souhaitez effectuer avec votre PDF et choisissez la colonne correspondante (c'est-à-dire Gérer un PDF, Convertir ou Office et PDF).
  3. Sélectionnez l'outil souhaité dans le menu en cliquant dessus.
  4. Lorsque vous êtes redirigé vers une nouvelle page, téléchargez un fichier à partir de votre appareil ou importez-le à partir de Google Drive, Dropbox ou OneDrive.
  5. Suivez les instructions pour traiter votre fichier en ligne.
  6. Choisissez ce que vous voulez faire d'autre avec le fichier résultant. Téléchargez-le sur votre appareil ou enregistrez-le sur votre compte de service de stockage en cloud.
  7. Modifiez vos documents en ligne à l'aide de l'éditeur PDF basé sur le Web.
  8. Partagez le fichier résultant par courrier électronique, fax ou SMS.

Le tableau de comparaison des fonctionnalités ultimes

En raison de la forte concurrence sur le Web, il peut être difficile de choisir la meilleure application, surtout si vous ne la comparez pas correctement avec les autres options. Notre liste de contrôle vous aidera à trouver rapidement votre outil préféré pour work with PDF. Veuillez regarder les puissantes fonctionnalités de AltoPDF.

Split PDF
Merge PDF
Combine & Reorder
Extract Pages
Compress PDF
Rotate PDF
No Software Downloads
Cloud storageUnlimitedNo infoNo info
PriceFreeFree 7-Day Trial for Smallpdf/ paidFree 7-Day Trial for Adobe Acrobat/ paid
Encryption and Security
Support24/7/365No info
No ads

Customer Reviews — Trusted by great people



Awesome converter! I can experiment with my documents using various options, combining them to get the file I need. No more trouble with unsuitable formats. I get the right one in a matter of seconds.



The best PDF converter I’ve ever come across! All-in-one solution! Extract, merge, split, convert to images and back… even e-signature is available. Everything’s on the table and for free.



I used to convert my PDF documents with other tools, but now that I found AltoPDF everything has become simpler. I can’t think of any drawbacks.

Your opinion matters!

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How to Work with a PDF Online

You can find plenty of different types of paid software designed for working with PDF, but it's vital that you make the right choice. So we have collected the best free features for you in one place that are available for any device — desktop or mobile.

Best Alternative to Convert from PDF

Make PDFs editable in a few clicks and for free. Simply drag and drop PDF files and transfer to a variety of popular file formats like spreadsheets, Word docs, presentations and more. 

Explore the benefit features for your convenience:

  1. Convert PDF to editable Microsoft Word doc.
  2. Save portable document format to Excel spreadsheets to use formulas and make reports.
  3. Transfer to PPT without losing formatting.
  4. Promptly change PDFs to images: JPG or PNG.
  5. Easily process docs and transform to HTML.
  6. Download results to your Google Drive, DropBox or OneDrive.
  7. Operate from your desktop or mobile device.
  8. Take advantage of secure data processing.

Converting PDF files is easy if you have the right tools for it. Alto PDF is a multi-purpose solution to help you anywhere and anytime. All you need is your preferable browser and an Internet connection.

Best Alternative to Convert from PDF

Only use a Safe Solution to Convert to PDF Online

PDF is known as a universal format to use and share on the Internet. For your convenience, you can effortlessly convert any document you have to PDF. 

Do this absolutely free of charge with AltoPDF and make use of advanced features:

  1. Save contract from Word to PDF for safe storing.
  2. Convert Excel pages and tables for better performance.
  3. Transfer the PowerPoint presentation to PDF keeping the formatting.
  4. Change multiple JPG and PNG images to a single doc to email fast.
  5. Easily save the Chrome HTML doc into the PDF file.
  6. Stay assured in a high level of data protection.
  7. Don’t stop editing — use our converter on your mobile device.
  8. Create portable document format documents from Web pages.
  9. Perform conversions regardless of an operating system.

Our free converter covers the needs of many people. No need to download or install anything. Work in your browser, upload and convert files quickly, instantly save, share or keep editing the newly created PDF.

Only use a Safe Solution to Convert to PDF Online

Easily Manage PDFs across your Apple Devices

Fill out forms, work with manuals and templates, and perform other important tasks without installing any special paid software on your Mac or other Apple devices like iPhone or iPad. 

AltoPDF converter works from your browser and undertakes conversion the exact way you need:

  1. Make use of instant PDF conversions that save time.
  2. Transfer Pages to Doc even on the go.
  3. Change Doc to Pages to redact it in the most convenient way.
  4. Operate it for free and with no registration.
  5. Save Numbers to XLS and share with Microsoft Office users.
  6. Convert XLS to Numbers to form reports and tables on Mac.
  7. Stay on a secured connection with AltoPDF.
  8. Explore additional innovative features. 

Our online platform is compatible equally well on iOS, Windows or Linux. Use it in your standard browser not only in the office or at home but from any place. Only an Internet connection is required.

Easily Manage PDFs across your Apple Devices

The Best way to Sign & Protect Your PDF

Nowadays, it is very important to keep up with everything, to save time on managing paperwork, to speed up the process of legal signing of documents and at the same time to remain protected. You can easily use your e-Signature to certify important PDF docs on the web while staying under security protection:

  1. Create your unique customized electronic signature.
  2. E-sign legal documents from any device.
  3. Put your legally valid signatures on contracts, tax forms, etc.
  4. Keep your sensitive data safe.
  5. Download a secured PDF to your cloud storage.
  6. Password protect your information.
  7. Remove the password from a secured doc, unlock PDFs online.
  8. Share docs with your teammates or email directly to the recipient.

Always use reliable programs to process PDF documents. Create your personal legally binding signature, sign docs electronically, protect them and share at ease with our advanced PDF editor online.

The Best way to Sign & Protect Your PDF

How to Find and Complete the Exact Form — Quick Search

The use of business, medical, and tax forms saves time and money on phone calls and trips to the office to simply pick up the paperwork. An additional advantage is that many PDF templates are fillable and digital. 

This means that you can work with your documents online:

  1. Use our federated search to get the best results.
  2. Find the appropriate document the fastest way. 
  3. The PDF editor will recognize the editable fields automatically.
  4. Type on the PDF forms and save changes.
  5. Edit templates and add fillable fields.
  6. Insert and adjust images, shapes, checkmarks.
  7. Fill in the professionally designed templates.
  8. Date and sign contracts and business forms.
  9. Complete tax returns and file them with the IRS
  10. Use multi-purpose tools online from any device.

Our browser-based AltoPDF service provides an advanced search for different kinds of documents, templates, samples. Fill out forms, work with guidelines and perform other essential duties without the need to install and pay for software.

How to Find and Complete the Exact Form — Quick Search


AltoPDF est une plateforme en ligne gratuite qui permet de manipuler des fichiers PDF. L'une de ses principales caractéristiques est que vous pouvez importer des fichiers à partir de GoogleDrive et, une fois qu'ils sont traités, les exporter à nouveau. Le service permet de convertir des fichiers Word, PPT, JPG et PNG rapidement, gratuitement, en toute sécurité et en conservant la qualité du document original.

Le saviez-vous?

Votre PDF devient un formulaire interactif

Convertissez les documents au format PDF à partir des formats les plus populaires et modifiez-les au moyen d’une barre d’outils étendue. Placez des champs remplissables n’importe où sur un document et donnez la possibilité à d’autres utilisateurs de remplir, signer et soumettre votre document. Veuillez insérer des menus déroulants, des listes, des champs de case à cocher, etc. Tout champ que vous créez peut être facilement déplacé, redimensionné ou supprimé. Veuillez importer des images, des flèches, des signets et des notes autocollantes.