diff --git a/blog/2025-09-26-Analysis-of-PG-18-Key-New-Features/index.md b/blog/2025-09-26-Analysis-of-PG-18-Key-New-Features/index.md
index 91dd14f5..05e16d76 100644
--- a/blog/2025-09-26-Analysis-of-PG-18-Key-New-Features/index.md
+++ b/blog/2025-09-26-Analysis-of-PG-18-Key-New-Features/index.md
@@ -4,7 +4,7 @@ title: In-Depth Analysis of PostgreSQL 18 Key New Features
authors: [official]
authorTwitter: IvorySql
category: PostgreSQL
-image: img/blog/covers/pg18-features.svg
+image: img/blog/covers/pg18-features-en.png
tags: [IvorySQL, Database, UUIDv7, PostgreSQL, I/O, OAuth]
---
diff --git a/blog/2026-02-10-ivorysql-5.0-oracle-to-postgresql-migration/index.md b/blog/2026-02-10-ivorysql-5.0-oracle-to-postgresql-migration/index.md
index 6158ec46..56e9e2fb 100644
--- a/blog/2026-02-10-ivorysql-5.0-oracle-to-postgresql-migration/index.md
+++ b/blog/2026-02-10-ivorysql-5.0-oracle-to-postgresql-migration/index.md
@@ -3,7 +3,7 @@ slug: ivorysql-5.0-oracle-to-postgresql-migration
title: IvorySQL 5.0+ - a game changer for Oracle to PostgreSQL transitions
authors: [Yasir Hussain Shah]
category: IvorySQL
-image: img/blog/covers/oracle-migration.svg
+image: img/blog/covers/oracle-migration-en.png
tags: [IvorySQL, Database, Oracle Compatible, PostgreSQL, migration]
---
diff --git a/blog/2026-07-06-oracle-compat-kernel/index.md b/blog/2026-07-06-oracle-compat-kernel/index.md
index 855667e6..62b8eca9 100644
--- a/blog/2026-07-06-oracle-compat-kernel/index.md
+++ b/blog/2026-07-06-oracle-compat-kernel/index.md
@@ -3,7 +3,7 @@ slug: oracle-compat-kernel
title: "Why Can Oracle Run on PostgreSQL? The Answer Lies in the Kernel"
authors: [ZhangChen]
category: IvorySQL
-image: img/blog/covers/oracle-compat-kernel-en.svg
+image: img/blog/covers/oracle-compat-kernel-en.png
tags: [IvorySQL, Oracle, PostgreSQL, Kernel, PL/iSQL, Migration]
---
diff --git a/blog/2026-07-08-ivorysql-agent/index.md b/blog/2026-07-08-ivorysql-agent/index.md
index 9c06afe6..c19c6465 100644
--- a/blog/2026-07-08-ivorysql-agent/index.md
+++ b/blog/2026-07-08-ivorysql-agent/index.md
@@ -3,7 +3,7 @@ slug: ivorysql-agent
title: "IvorySQL Agent: AI-Powered Database Management"
authors: [Oreo Yang]
category: IvorySQL
-image: img/blog/covers/ivorysql-agent-en.svg
+image: img/blog/covers/ivorysql-agent-en.png
tags: [IvorySQL, AI, Agent, RAG, NL2SQL, PostgreSQL]
---
diff --git a/static/img/blog/covers/ivorysql-agent-en.png b/static/img/blog/covers/ivorysql-agent-en.png
new file mode 100644
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diff --git a/static/img/blog/covers/ivorysql-agent-en.svg b/static/img/blog/covers/ivorysql-agent-en.svg
deleted file mode 100644
index 7bb7a8e4..00000000
--- a/static/img/blog/covers/ivorysql-agent-en.svg
+++ /dev/null
@@ -1,56 +0,0 @@
-
diff --git a/static/img/blog/covers/ivorysql-deepdive.jpg b/static/img/blog/covers/ivorysql-deepdive.jpg
index c7e7aedb..809ad32e 100644
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diff --git a/static/img/blog/covers/oracle-compat-kernel-en.png b/static/img/blog/covers/oracle-compat-kernel-en.png
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diff --git a/static/img/blog/covers/oracle-compat-kernel-en.svg b/static/img/blog/covers/oracle-compat-kernel-en.svg
deleted file mode 100644
index 2a7c1cab..00000000
--- a/static/img/blog/covers/oracle-compat-kernel-en.svg
+++ /dev/null
@@ -1,47 +0,0 @@
-
diff --git a/static/img/blog/covers/oracle-migration-en.png b/static/img/blog/covers/oracle-migration-en.png
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index 00000000..607fba48
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diff --git a/static/img/blog/covers/oracle-migration.svg b/static/img/blog/covers/oracle-migration.svg
deleted file mode 100644
index a970adea..00000000
--- a/static/img/blog/covers/oracle-migration.svg
+++ /dev/null
@@ -1,81 +0,0 @@
-
diff --git a/static/img/blog/covers/pg18-features-en.png b/static/img/blog/covers/pg18-features-en.png
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diff --git a/static/img/blog/covers/pg18-features.svg b/static/img/blog/covers/pg18-features.svg
deleted file mode 100644
index 8fd548f5..00000000
--- a/static/img/blog/covers/pg18-features.svg
+++ /dev/null
@@ -1,80 +0,0 @@
-